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Nově popsané druhy v roce 2004 (374)

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  • Abalistes filamentosus Matsuura & Yoshino, 2004
    Matsuura, K. & T. Yoshino. 2004. A new triggerfish of the genus Abalistes (Tetraodontiformes: Balistidae) from the western Pacific. Rec. Aust. Mus. v. 56 (no. 2): 189-194.
  • Acanthoplesiops naka Mooi & Gill, 2004
    Mooi, R. D. & A. C. Gill   2004. Description of a new species of the fish genus Acanthoplesiops Regan (Teleostei: Plesiopidae: Acanthoclininae) from Tonga. Zootaxa No. 432: 1-10.
  • Acromycter longipectoralis Karmovskaya. 2004
    Karmovskaya, E. S. 2004. Benthopelagic bathyal conger eels of families Congridae and Nettastomatidae from the western tropical Pacific, with descriptions of ten new species. J. Ichthyol. v. 44 (Suppl. 1): S1-S32.
  • Acyrtus pauciradiatus Sampaio, de Anchieta, Nunes & Mendes, 2004
    Sampaio, C. L. S., J. de Anchieta, C. C. Nunes & L. F. Mendes. 2004. Acyrtus pauciradiatus, a new species of clingfish (Teleostei: Gobiesocidae) from Fernando de Noronha Archipelago, Pernabuco state, northeastern Brazil. Neotropical Ichthyol. v. 2 (no. 4): 205-208.
  • Adrianichthys roseni Parenti & Soeroto, 2004
    Parenti, L. R. & B. Soeroto. 2004. Adrianichthys roseni and Oryzias nebulosus, two new ricefishes (Atherinomorpha: Beloniformes: Adrianichthyidae) from Lake Poso, Sulawesi, Indonesia. Ichth. Research v. 51 (no. 1): 10-19.
  • Akko rossi Van Tassell & Baldwin, 2004
    Van Tassell, J. L. & C. C. Baldwin. 2004. A review of the gobiid genus Akko (Teleostei: Gobiidae) with description of a new species. Zootaxa No. 462: 1-15.
  • Akysis meridionalis Ng & Siebert, 2004
    Ng, H. H. & D. J. Siebert. 2004. A new species of the catfish genus Akysis (Siluriformes: Akysidae) from southern Borneo. Zootaxa No. 733: 1-8.
  • Akysis vespa Ng & Kottelat, 2004
    Ng, H. H. & M. Kottelat. 2004. Akysis vespa a new species of catfish (Siluriformes: Akysidae) from the Ataran River drainage (Myanmar). Ichthyol. Explor. Freshwaters v. 15 (no. 3): 193-200.
  • Alabes elongata Hutchins, 2004
    Hutchins, B. & S. Morrison   2004. Five new species of the genus Alabes (Gobiesocidae: Cheilobranchinae). Rec. Aust. Mus. v. 56 (no. 2): 147-158.
  • Alabes gibbosa Hutchins, 2004
    Hutchins, B. & S. Morrison   2004. Five new species of the genus Alabes (Gobiesocidae: Cheilobranchinae). Rec. Aust. Mus. v. 56 (no. 2): 147-158.
  • Alabes obtusirostris Hutchins, 2004
    Hutchins, B. & S. Morrison   2004. Five new species of the genus Alabes (Gobiesocidae: Cheilobranchinae). Rec. Aust. Mus. v. 56 (no. 2): 147-158.
  • Alabes occidentalis Hutchins, 2004
    Hutchins, B. & S. Morrison   2004. Five new species of the genus Alabes (Gobiesocidae: Cheilobranchinae). Rec. Aust. Mus. v. 56 (no. 2): 147-158.
  • Alabes scotti Hutchins, 2004
    Hutchins, B. & S. Morrison   2004. Five new species of the genus Alabes (Gobiesocidae: Cheilobranchinae). Rec. Aust. Mus. v. 56 (no. 2): 147-158.
  • Alticorpus geoffreyi Snoeks & Walapa, 2004
    Snoeks, J. & R. Walapa. 2004. The genus Alticorpus Stauffer & McKaye 1988. Pp. 27-56 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Amblyeleotris bellicauda Randall, 2004
    Randall, J. E.   2004. Five new shrimp gobies of the genus Amblyeleotris from islands of Oceania. Aqua, J. Ichthy. Aquat. Biol. v. 8 (no. 2): 61-78.
  • Amblyeleotris biguttata Randall, 2004
    Randall, J. E.   2004. Five new shrimp gobies of the genus Amblyeleotris from islands of Oceania. Aqua, J. Ichthy. Aquat. Biol. v. 8 (no. 2): 61-78.
  • Amblyeleotris ellipse Randall, 2004
    Randall, J. E.   2004. Five new shrimp gobies of the genus Amblyeleotris from islands of Oceania. Aqua, J. Ichthy. Aquat. Biol. v. 8 (no. 2): 61-78.
  • Amblyeleotris katherine Randall, 2004
    Randall, J. E.   2004. Five new shrimp gobies of the genus Amblyeleotris from islands of Oceania. Aqua, J. Ichthy. Aquat. Biol. v. 8 (no. 2): 61-78.
  • Amblyeleotris stenotaeniata Randall, 2004
    Randall, J. E.   2004. Five new shrimp gobies of the genus Amblyeleotris from islands of Oceania. Aqua, J. Ichthy. Aquat. Biol. v. 8 (no. 2): 61-78.
  • Amblyrhynchichthys micracanthus Ng & Kottelat, 2004
    Ng, H. H. & M. Kottelat   2004. Amblyrhynchichthys micracanthus, a new species of cyprinid fish from Indochina (Cypriniformes: Cyprinidae) . Rev. Suisse Zool. v. 111 (no. 2): 425-432, 683 [erratum].
  • Aphyolebias boticarioi Costa, 2004
    Costa, W. J. E. M. 2004. Moema apurinan sp. n. and Aphyolebias boticarioi sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): two new annual killifishes from the Rio Purus basin, Brazilian Amazon. Zootaxa No. 707: 1-12.
  • Aphyosemion plagitaenium Huber, 2004
    Huber, J. H. 2004. Description of a new Aphyosemion species from Congo, A. plagitaenium n. sp., exhibiting a probable intra-generic color convergence with oblique bars. Freshwater Mar. Aquar. v. 27 (no. 12): 70-74.
  • Apistogramma alacrina Kullander, 2004
    Kullander, S. O. 2004. Apistogramma alacrina, a new species of cichlid fish (Teleostei: Cichlidae) from Colombia. Ichthyol. Explor. Freshwaters v. 15 (no. 1): 41-48.
  • Apistogramma baenschi Römer, Hahn, Römer, Soares & Wöhler, 2004
    Römer, U., I. Hahn, Römer, E., Soares, D. P. & M. Wöhler. 2004. Apistogramma baenschi sp. n. Beschreibung eines weiteren geophaginen Zwergcichliden (Teleostei: Perciformes) aus Peru. Das Aquarium No. 422 [Aug. 2004]: 15-30.
  • Apistogramma eremnopyge Ready & Kullander, 2004
    Ready, J. S. & S. O. Kullander. 2004. Apistogramma eremnopyge, a new species of cichlid fish (Teleostei: Cichlidae) from Peru. Zootaxa No. 564: 1-10.
  • Apristurus melanoasper Iglésias, Nakaya & Stehmann, 2004
    Iglésias, S. P., K. Nakaya & M. Stehmann. 2004. Apristurus melanoasper, a new species of deep-water catshark from the North Atlantic. (Chondrichthys: Carcharhiniformes: Scyliorhinidae). Cybium v. 28 (no. 4): 345-356.
  • Apteronotus eschmeyeri de Santana, Maldonado-Ocampo, Severi & Mendes, 2004
    Santana, C. D. de, J. A. Maldonado-Ocampo, W. Severi & G. N. Mendes. 2004. Apteronotus eschmeyeri, a new species of ghost knifefish from the Magdalena Basin, Colombia (Gymnotiformes: Apteronotidae). Zootaxa No. 410: 1-11.
  • Aptychotrema timorensis Last, 2004
    Last, P. R.   2004. Rhinobatos sainsburyi n. sp. and Aptychotrema timorensis n. sp. -- two new shovelnose rays (Batoidea: Rhinobatidae) from the eastern Indian Ocean. Rec. Aust. Mus. v. 56 (no. 2): 201-208.
  • Argentina brasiliensis Kobylyanskii, 2004
    Kobylianskii, S. G.   2004. Argentina brasiliensis sp. nova (Argentinidae) new species of argentinid fish from the coastal subtropical waaters of the southwestern Atlantic. Voprosy Ikhtiol. v. 44: 607-612.
  • Ariosoma multivertebratum Karmovskaya, 2004
    Karmovskaya, E. S. 2004. Benthopelagic bathyal conger eels of families Congridae and Nettastomatidae from the western tropical Pacific, with descriptions of ten new species. J. Ichthyol. v. 44 (Suppl. 1): S1-S32.
  • Ariosoma sazonovi Karmovskaya, 2004
    Karmovskaya, E. S. 2004. Benthopelagic bathyal conger eels of families Congridae and Nettastomatidae from the western tropical Pacific, with descriptions of ten new species. J. Ichthyol. v. 44 (Suppl. 1): S1-S32.
  • Ariosoma sereti Karmovskaya, 2004
    Karmovskaya, E. S. 2004. Benthopelagic bathyal conger eels of families Congridae and Nettastomatidae from the western tropical Pacific, with descriptions of ten new species. J. Ichthyol. v. 44 (Suppl. 1): S1-S32.
  • Astyanax biotae Castro & Vari, 2004
    Castro, R. M. C. & R. P. Vari. 2004. Astyanax biotae, a new species of stream fish from the Rio Paranapanema basin, upper Rio Paraná system, southeastern Brazil (Ostariophysi: Characiformes: Characidae). Proc. Biol. Soc. Wash. v. 117 (no. 3): 330-338.
  • Astyanax dnophos Lima & Zuanon, 2004
    Lima, F. C. T. & J. Zuanon. 2004. A new species of Astyanax (Characiformes: Characidae) from the rapids of the lower rio Xingu, Brazil. Neotropical Ichthyol. v. 2 (no. 3): 117-122.
  • Astyanax chico Casciotta & Almirón, 2004
    Casciotta, J. R. & A. E. Almirón. 2004. Astyanax chico sp. n. -- a new species from the río San Francisco basin, northwest of Argentina (Teleostei: Characiformes: Characidae). Zool. Abh., Staat. Mus. Tierk. Dresden v. 54: 11-17.
  • Astyanax latens Mirande, Aguilera & Azpelicueta, 2004
    Mirande, J. M., G. Aguilera & M. de las M. Azpelicueta   2004. A new species of Astyanax (Characiformes, Characidae) from the upper río Bermejo basin, Salta, Argentina. Rev. Suisse Zool. v. 111 (no. 1): 213-223.
  • Austrolebias arachan Loureiro, Azpelicueta & García, 2004
    Loureiro, M., M. de las M. Azpelicueta & G. García   2004. Austrolebias arachan (Cyprinodontiformes, Rivulidae), a new species of annual fish from northeastern Uruguay. Rev. Suisse Zool. v. 111 (no. 1): 21-30.
  • Austrolebias varzeae Costa, Reis & Behr, 2004
    Costa, W. J. E. M., R. E. Reis & E. R. Behr. 2004. Austrolebias varzeae, a new annual fish from the upper rio Uruguay basin, southern Brazil (Cyprinodontiformes: Rivulidae). Neotropical Ichthyol. v. 2 (no. 1): 13-17.
  • Badis tuivaiei Vishwanath & Shanta, 2004
    Vishwanath, W. & K. Shanta   2004. A new fish species of the Indo-Burmese genus Badis Bleeker (Teleostei: Perciformes) from Manipur, India. Zoos' Print J. v. 19 (no.9): 1619-1621.
  • Batasio elongatus Ng, 2004
    Ng, H. H.   2004. Batasio elongatus, a new species of bagrid catfish from southwest Myanmar (Siluriformes: Bagridae). Ichthyol. Explor. Freshwaters v. 15 (no. 1): 67-70.
  • Batasio macronotus Ng & Edds, 2004
    Ng, H. H. & D. R. Edds. 2004. Batasio macronatus, a new species of bagrid catfish from Nepal (Teleostei: Bagridae). Ichthyol. Explor. Freshwaters v. 15 (no. 4): 295-300.
  • Batasio sharavatiensis Bhatt & Jayaram, 2004
    Bhatt, A. & K. C. Jayaram   2004. A new species of the genus Batasio Blyth (Siluriformes: Bagridae) from Sharavati River, Uttara Kannada, Karnataka. Zoos' Print J. v. 19 (no. 2): 1339-1342.
  • Bathyraja cousseauae Díaz de Astarloa, Juan Martín, Mabragana & Ezequiel, 2004
    Díaz de Astarloa, J. M. & E. Mabragaña   2004. Bathyraja cousseauae sp. n.: a new softnose skate from the southwestern Atlantic (Rajiformes, Rajidae). Copeia 2004 (no. 2): 326-335.
  • Bathyraja mariposa Stevenson, Orr, Hoff & McEachran, 2004
    Stevenson, D. E., J. W. Orr, G. R. Hoff & J. D. McEachran   2004. Bathyraja mariposa: a new species of skate (Rajidae: Arhynchobatinae) from the Aleutian Islands. Copeia 2004 (no. 2): 305-314.
  • Betta aurigans Tan & Lim, 2004
    Tan, H. H. & K. K. P. Lim. 2004. Inland fishes from the Anambas and Natuna Islands, South China Sea, with description of a new species of Betta (Teleostei: Osphronemidae). Raffles Bull. Zool. Suppl. No. 11: 107-115.
  • Betta ibanorum Tan & Ng, 2004
    Tan, H. H. & P. K. L. Ng. 2004. Two new species of freshwater fish (Teleostei: Balitoridae, Osphronemidae) from southern Sarawak. Sarawak Bau Limestone Biodiversity. Sarawak Mus. J. Spec. issue 6: 267-284.
  • Betta pallida Schindler & Schmidt, 2004
    Schindler, I. & J. Schmidt. 2004. Betta pallida spec. nov., a new fighting fish from southern Thailand (Teleostei: Belontiidae). Zeitschrift Fischk. v. 7 (no. 1): 1-4.
  • Blachea longicaudalis Karmovskaya, 2004
    Karmovskaya, E. S. 2004. Benthopelagic bathyal conger eels of families Congridae and Nettastomatidae from the western tropical Pacific, with descriptions of ten new species. J. Ichthyol. v. 44 (Suppl. 1): S1-S32.
  • Botia kubotai Kottelat, 2004
    Kottelat, M. 2004. Botia kubotai, a new species of loach (Teleostei: Cobitidae) from the ataran River basin (Myanmar), with comments on botiinae nomenclature and diagnosis of a new genus. Zootaxa No. 401: 1-18.
  • Bregmaceros pseudolanceolatus Torii, Javonillo & Ozawa, 2004
    Torii, A., R. Javonillo & T. Ozawa. 2004. Reexamination of Bregmaceros lanceolatus Shen, 1960 with description of a new species Bregmaceros pseudolanceolatus (Gadiformes: Bregmacerotidae). Ichth. Research No. 51: 106-112.
  • Brycon gouldingi Lima, 2004
    Lima, F. C. T. 2004. Brycon gouldingi, a new species from the rio Tocantins drainage, Brazil (Ostariophysi: Characiformes: Characidae), with a key to the species in the basin. Ichthyol. Explor. Freshwaters v. 15 (no. 3): 279-287.
  • Bryconamericus ecai da Silva, 2004
    da Silva, J. F. P. 2004. Two new species of Bryconamericus Eigenmann (Characiformes: Characidae) from southern Brazil. Neotropical Ichthyol. v. 2 (no. 2): 55-60.
  • Bryconamericus ikaa Casciotta, Almirón & Azpelicueta, 2004
    Casciotta, J. R., A. E. Almirón & M. M. de las M. Azpelicueta. 2004. Bryconamericus ikaa, a new species from tributaries of the río Iguazú in Argentina (Characiformes, Characidae). Ichthyol. Explor. Freshwaters v. 15 (no. 1): 61-66.
  • Bryconamericus patriciae da Silva, 2004
    da Silva, J. F. P. 2004. Two new species of Bryconamericus Eigenmann (Characiformes: Characidae) from southern Brazil. Neotropical Ichthyol. v. 2 (no. 2): 55-60.
  • Bryconamericus ytu Almirón, Azpelicueta & Casciotta, 2004
    Almirón, A. E., M. Azpelicueta & J. R. Casciotta. 2004. A new species of Bryconamericus from the arroya Shangay, río Uruguay basin, Argentina (Teleostei: Characiformes: Characidae). Zool. Abh., Staat. Mus. Tierk. Dresden v. 54: 3-10.
  • Bufoceratias shaoi Pietsch, Ho & Chen, 2004
    Pietsch, T. W., H.-C. Ho & H.-M. Chen. 2004. Revision of the deep-sea anglerfish genus Bufoceratias Whitley (Lophiiformes: Ceratioidei: Diceratiidae), with description of a new species from the Indo-West Pacific Ocean. Copeia 2004 (No. 1): 98-107.
  • Caelorinchus leptorhinus Chiou, Shao & Iwamoto, 2004
    Chiou, M.-L., K.-T. Shao & T. Iwamoto. 2004. New species of Caelorinchus (Macrouridae, Gadiformes, Teleostei) from Taiwan, with a redescription of Caelorinchus brevirostris Okamura. Copeia 2004 (no. 2): 298-304.
  • Caelorinchus sheni Chiou, Shao & Iwamoto, 2004
    Chiou, M.-L., K.-T. Shao & T. Iwamoto. 2004. A new species, Caelorinchus sheni, and 19 new records of grenadiers (Pisces: Gadiformes: Macrouridae) from Taiwan. Zool. Studies v. 43 (no. 1): 35-50.
  • Caelorinchus vityazae Iwamoto, Shcherbachev & Marquardt, 2004
    Iwamoto, T., Y. N. Shcherbachev & B. Marquardt. 2004. Grenadiers (Gadiformes, Teleostei) of Walters Shoals, southwestern Indian Ocean, with description of a new "west-wind drift" species. Proc. Calif. Acad. Sci. v. 55 (no. 10): 190-207.
  • Callichthys serralabium Lehmann & Reis, 2004
    Lehmann A., P. & R. E. Reis. 2004. Callichthys serralabium: a new species of neotropical catfish from the upper Orinoco and Negro rivers (Siluriformes: Callichthyidae). Copeia 2004 (no. 2): 336-343.
  • Castleichthys auritus Smith, 2004
    Smith, D. G. 2004. A new genus and species of congrid eel (Teleostei: Anguilliformes: Congridae) from Western Australia. Rec. Aust. Mus. v. 56 (no. 2): 143-146.
  • Clarias pseudonieuhofii Sudarto, Teugels & Pouyaud, 2004
    Sudarto, G. G. Teugels & L. Pouyaud. 2004. Description of a new clariid catfish, Clarias psuedonieuhofii from West Borneo (Siluriformes: Clariidae). Zool. Studies v. 43 (no. 1): 8-19.
  • Clarias sulcatus Ng, 2004
    Ng, H. H. 2004. Clarias sulcatus, a new walking catfish (Teleostei: Clariidae) from Pulau Redang. Ichthyol. Explor. Freshwaters v. 15 (no. 4): 289-294.
  • Clupisoma roosae Ferraris 2004
    Ferraris, C. J., Jr. 2004. A new species of the Asian schilbid catfish genus Clupisoma from Myanmar, with a redescription of Clupisoma prateri Hora (Osteichthyes: Siluriformes: Schilbidae). Zootaxa No. 437: 1-10.
  • Cocotropus microps Johnson, 2004
    Johnson, J. W. 2004. Two new species and two new records of aploactinid fishes (Pisces: Scorpaeniformes) from Australia. Rec. Aust. Mus. v. 56 (no. 2): 179-188.
  • Cocotropus richeri Fricke, 2004
    Fricke, R. 2004. Cocotropus richeri, a new species of velvetfish (Teleostei: Aploactinidae) from Lifou, Loyalty Islands. Stuttg. Beitr. Naturk. Ser. A, No. 660: 1-7.
  • Cocotropus roseomaculatus Imamura & Shinohara, 2004
    Imamura, H. & G. Shinohara. 2004. A new specis of Cocotropus (Acanthopterygii: Teleostei: Aploactinidae) from South Africa, western Indian Ocean. Species Diversity v. 9 (no. 3): 201-205.
  • Congriscus marquesaensis Karmovskaya, 2004
    Karmovskaya, E. S. 2004. Benthopelagic bathyal conger eels of families Congridae and Nettastomatidae from the western tropical Pacific, with descriptions of ten new species. J. Ichthyol. v. 44 (Suppl. 1): S1-S32.
  • Corydoras albolineatus Knaack, 2004
    Knaack, J. 2004. Beschreibung von sechs neuen Arten der Gattung Corydoras La Cépède, 1803 (Teleostei: Siluriformes: Callichthyidae). Zool. Abh., Staat. Mus. Tierk. Dresden v. 54: 55-105.
  • Corydoras isbrueckeri Knaack, 2004
    Knaack, J. 2004. Beschreibung von sechs neuen Arten der Gattung Corydoras La Cépède, 1803 (Teleostei: Siluriformes: Callichthyidae). Zool. Abh., Staat. Mus. Tierk. Dresden v. 54: 55-105.
  • Corydoras negro Knaack, 2004
    Knaack, J. 2004. Beschreibung von sechs neuen Arten der Gattung Corydoras La Cépède, 1803 (Teleostei: Siluriformes: Callichthyidae). Zool. Abh., Staat. Mus. Tierk. Dresden v. 54: 55-105.
  • Corydoras noelkempffi Knaack, 2004
    Knaack, J. 2004. Beschreibung von sechs neuen Arten der Gattung Corydoras La Cépède, 1803 (Teleostei: Siluriformes: Callichthyidae). Zool. Abh., Staat. Mus. Tierk. Dresden v. 54: 55-105.
  • Corydoras paragua Knaack, 2004
    Knaack, J. 2004. Beschreibung von sechs neuen Arten der Gattung Corydoras La Cépède, 1803 (Teleostei: Siluriformes: Callichthyidae). Zool. Abh., Staat. Mus. Tierk. Dresden v. 54: 55-105.
  • Corydoras paucerna Knaack, 2004
    Knaack, J. 2004. Beschreibung von sechs neuen Arten der Gattung Corydoras La Cépède, 1803 (Teleostei: Siluriformes: Callichthyidae). Zool. Abh., Staat. Mus. Tierk. Dresden v. 54: 55-105.
  • Creagrutus varii Ribeiro, Benine & Figueiredo, 2004
    Ribeiro, A. C., R. C. Benine & C. A. Figueiredo. 2004. A new species of Creagrutus Günther (Teleostei: Ostariophysi: Characiformes), from the upper Río Paraná basin, central Brazil. J. Fish Biol. v. 64: 597-611.
  • Cryptocentrus tentaculatus Hoese & Larson, 2004
    Hoese, D. F. & H. K. Larson. 2004. Description of a new species of Cryptocentrus (Teleostei: Gobiidae) from northern Australia, with comments on the genus. The Beagle (Rec. Mus. Art Galleries N. Terr.) v. 20: 167-174.
  • Cypho zaps Gill 2004
    Gill, A. C. 2004. Revision of the Indo-Pacific dottyback fish subfamily Pseudochrominae (Perciformes: Pseudochromidae). Smithiana Monogr. No. 1: 1-213, Pls. 1-12.
  • Dasyatis colarensis Santos, Gomes & Charvet-Almeida, 2004
    Santos, H. R. S., U. L. Gomes & P. Charvet-Almeida. 2004. A new species of whiptail stingray of the genus Dasyatis Rafinesque, 1810 from the southwestern Atlantic Ocean (Chondrichthyes: Myliobatiformes: Dasyatidae). Zootaxa No. 492: 1-12.
  • Dasyatis hypostigma Santos & Carvalho, 2004
    Santos, H. R. S. & M. R. de Carvalho. 2004. Description of a new species of whiptailed stingray from the southwestern Atlantic Ocean (Chondrichthyes, Myliobatiformes, Dasyatidae). Bol. Mus. Nac., Zool. (Brasil) No. 516: 1-24.
  • Dunckerocampus naia Allen & Kuiter, 2004
    Allen, G. R. & R. H. Kuiter. 2004. Dunckerocampus naia, a new species of pipefish (Pisces: Syngnathidae) from the western Pacific. Aqua, J. Ichthy. Aquat. Biol. v. 9 (no. 1): 1-6.
  • Ecsenius caeruliventris Springer & Allen, 2004
    Springer, V. G. & G. R. Allen. 2004. Ecsenius caeruliventris and E. shirleyae, two new species of blenniid fishes from Indonesia, and new distribution records for other species of Ecsenius. Zootaxa No. 791: 1-12.
  • Ecsenius shirleyae Springer & Allen, 2004
    Springer, V. G. & G. R. Allen. 2004. Ecsenius caeruliventris and E. shirleyae, two new species of blenniid fishes from Indonesia, and new distribution records for other species of Ecsenius. Zootaxa No. 791: 1-12.
  • Elacatinus pridisi Guimarães, Gasparini & Rocha, 2004
    Guimarães, R. Z. P., J. L. Gasparini & L. A. Rocha. 2004. A new cleaner goby of the genus Elacatinus (Teleostei: Gobiidae), from Trindade Island, off Brazil. Zootaxa No. 770: 1-8.
  • Emblemariopsis dianae Tyler & Hastings, 2004
    Tyler, J. C. & P. A. Hastings. 2004. Emblemariopsis dianae, a new species of chaenopsid fish from the western Caribbean off Belize (Blennioidei). Aqua, J. Ichthy. Aquat. Biol. v. 8 (no. 2): 49-60.
  • Encheliophis chardewalli Parmentier, 2004
    Parmentier, E. 2004. Encheliophis chardewalli: a new species of Carapidae (Ophidiiformes) from French Polynesia, with a redescription of Encheliophis vermicularis. Copeia 2004 (No. 1): 62-67.
  • Epactionotus aky Azpelicueta, Casciotta, Almirón & Körber, 2004
    Azpelicueta, M., J. Casciotta, A. Almirón & S. Körber. 2004. A new species of Otothyrini (Siluriformes: Loricariidae: Hypopotopomatinae) from the Río Uruguay basin, Argentina. Verh. Ges. Ichthyol. v. 4 (2004): 81-90.
  • Epactionotus yasi Almirón, Azpelicueta & Casciotta, 2004
    Almirón, A. E., M. Azpelicueta & J. R. Casciotta. 2004. A new species of Epactionotus (Siluriformes: Loricariidae: Otothyrini) from the río Iguazú basin, Argentina. Zool. Abh., Staat. Mus. Tierk. Dresden v. 54: 137-144.
  • Eptatretus fernholmi McMillan & Wisner, 2004
    McMillan, C. B. & R. L. Wisner. 2004. Review of the hagfishes (Mxyinidae, Myxiniformes) of the northwestern Pacific Ocean, with descriptions of three new species, Eptatretus fernholmi, Paramyxine moki, and P. walkeri. Zool. Studies v. 43 (no. 1): 51-73.
  • Eptatretus lakeside Mincarone & McCosker, 2004
    Mincarone, M. M. & J. E. McCosker. 2004. Eptatretus lakeside sp. nov., a new species of five-gilled hagfish (Myxinidae) from the Galápagos Islands. Proc. Calif. Acad. Sci. v. 55 (no. 6): 162-168.
  • Erromyzon compactus Kottelat, 2004
    Kottelat, M. 2004. On the Bornean and Chinese Protomyzon (Teleostei: Balitoridae), with descriptions of two new genera and two new species from Borneo, Vietnam and China. Ichthyol. Explor. Freshwaters v. 15 (no. 4): 301-310.
  • Eustomias jimcraddocki Sutton & Hartel, 2004
    Sutton, T. T. & K. E. Hartel. 2004. New species of Eustomias (Teleostei: Stomiidae) from the western North Atlantic, with a review of the subgenus Neostomias. Copeia 2004 (No. 1): 116-121.
  • Eviota hoesei Gill & Jewett, 2004
    Gill, A. C. & S. L. Jewett. 2004. Eviota hoesei and E. readerae, new species of fish from the southwest Pacific, with comments on the identity of E. corneliae Fricke (Perciformes: Gobiidae). Rec. Aust. Mus. v. 56 (no. 2): 235-240.
  • Eviota readerae (Gill & Jewett, 2004)
    Gill, A. C. & S. L. Jewett. 2004. Eviota hoesei and E. readerae, new species of fish from the southwest Pacific, with comments on the identity of E. corneliae Fricke (Perciformes: Gobiidae). Rec. Aust. Mus. v. 56 (no. 2): 235-240.
  • Garra flavatra Kullander & Fang, 2004
    Kullander, S. O. & F. Fang. 2004. Seven new species of Garra (Cyprinidae: Cyprininae) from the Rakhine Yoma, southern Myanmar. Ichthyol. Explor. Freshwaters v. 15 (no. 3): 257-278.
  • Garra nigricollis Kullander & Fang, 2004
    Kullander, S. O. & F. Fang. 2004. Seven new species of Garra (Cyprinidae: Cyprininae) from the Rakhine Yoma, southern Myanmar. Ichthyol. Explor. Freshwaters v. 15 (no. 3): 257-278.
  • Garra poecilura Kullander & Fang, 2004
    Kullander, S. O. & F. Fang. 2004. Seven new species of Garra (Cyprinidae: Cyprininae) from the Rakhine Yoma, southern Myanmar. Ichthyol. Explor. Freshwaters v. 15 (no. 3): 257-278.
  • Garra propulvinus Kullander & Fang, 2004
    Kullander, S. O. & F. Fang. 2004. Seven new species of Garra (Cyprinidae: Cyprininae) from the Rakhine Yoma, southern Myanmar. Ichthyol. Explor. Freshwaters v. 15 (no. 3): 257-278.
  • Garra rakhinica Kullander & Fang, 2004
    Kullander, S. O. & F. Fang. 2004. Seven new species of Garra (Cyprinidae: Cyprininae) from the Rakhine Yoma, southern Myanmar. Ichthyol. Explor. Freshwaters v. 15 (no. 3): 257-278.
  • Garra spilota Kullander & Fang, 2004
    Kullander, S. O. & F. Fang. 2004. Seven new species of Garra (Cyprinidae: Cyprininae) from the Rakhine Yoma, southern Myanmar. Ichthyol. Explor. Freshwaters v. 15 (no. 3): 257-278.
  • Garra vittatula Kullander & Fang, 2004
    Kullander, S. O. & F. Fang. 2004. Seven new species of Garra (Cyprinidae: Cyprininae) from the Rakhine Yoma, southern Myanmar. Ichthyol. Explor. Freshwaters v. 15 (no. 3): 257-278.
  • Gastromyzon ocellatus Tan & Ng, 2004
    Tan, H. H. & P. K. L. Ng. 2004. Two new species of freshwater fish (Teleostei: Balitoridae, Osphronemidae) from southern Sarawak. Sarawak Bau Limestone Biodiversity. Sarawak Mus. J. Spec. issue 6: 267-284.
  • Geophagus abalios López-Fernández & Taphorn, 2004
    López-Fernández, H. & D. C. Taphorn. 2004. Geophagus abalios, G. dicrozoster and G. winemilleri (Perciformes: Cichlidae), three new species from Venezuela. Zootaxa No. 439: 1-27.
  • Geophagus dicrozoster López-Fernández & Taphorn, 2004
    López-Fernández, H. & D. C. Taphorn. 2004. Geophagus abalios, G. dicrozoster and G. winemilleri (Perciformes: Cichlidae), three new species from Venezuela. Zootaxa No. 439: 1-27.
  • Geophagus winemilleri López-Fernández & Taphorn, 2004
    López-Fernández, H. & D. C. Taphorn. 2004. Geophagus abalios, G. dicrozoster and G. winemilleri (Perciformes: Cichlidae), three new species from Venezuela. Zootaxa No. 439: 1-27.
  • Gnathophis asanoi Karmovskaya, 2004
    Karmovskaya, E. S. 2004. Benthopelagic bathyal conger eels of families Congridae and Nettastomatidae from the western tropical Pacific, with descriptions of ten new species. J. Ichthyol. v. 44 (Suppl. 1): S1-S32.
  • Gnathophis neocaledoniensis Karmovskaya, 2004
    Karmovskaya, E. S. 2004. Benthopelagic bathyal conger eels of families Congridae and Nettastomatidae from the western tropical Pacific, with descriptions of ten new species. J. Ichthyol. v. 44 (Suppl. 1): S1-S32.
  • Gobio kubanicus Vasil'eva, 2004
    Vasil'eva, E. D., V. P. Vasil'ev & T. I. Kuga. 2004. On taxonomy of gudgeons of the genus Gobio (Gobioninae, Cyprinidae) of Europe: a new species of gudgeon Gobio kubanicus sp. nova from the Kuban River basin. Voprosy Ikhtiol. v. 44 (no. 6): 766-782.
  • Gobio lozanoi Doadrio & Madeira, 2004
    Doadrio, I. & M. J. Madeira. 2004. A new species of the genus Gobio Cuvier, 1816 (Actynopterygii [sic], Cyprinidae) from the Iberian Peninsula and southwestern France. Graellsia v. 60 (no. 1): 107-116.
  • Goniistius francisi (Burridge, 2004)
    Burridge, C. P. 2004. Cheilodactylus (Goniistius) francisi, a new species of morwong (Perciformes: Cirrhitoidea) from th southwest Pacific. Rec. Aust. Mus. v. 56 (no. 2): 231-234.
  • Gorgasia thamani Greenfield & Niesz, 2004
    Greenfield, D. W. & S. Niesz. 2004. Gorgasia thamani, a new species of garden eel from Fiji (Teleostei: Congridae: Heterocongrinae). Proc. Calif. Acad. Sci. v. 55 (no. 17): 373-376.
  • Grammonus thielei Nielsen & Cohen, 2004
    Nielsen, J. G. & D. M. Cohen. 2004. Grammonus thielei (Ophidiiformes: Bythitidae) -- a new bythitid cavefish from off Sulawesi, Indonesia. The Beagle (Rec. Mus. Art Galleries N. Terr.) v. 20: 83-86.
  • Gunterichthys bussingi Møller, Schwarzhans & Nielsen, 2004
    Møller, P. R., W. Schwarzhans & J. G. Nielsen. 2004. Review of the American Dinematichthyini (Teleostei: Bythitidae). Part I. Dinematichthys, Gunterichthys, Typhliasina and two new gerera. Aqua, J. Ichthy. Aquat. Biol. v. 8 (no. 4): 141-192 + front and back cover.
  • Gunterichthys coheni Møller, Schwarzhans & Nielsen, 2004
    Møller, P. R., W. Schwarzhans & J. G. Nielsen. 2004. Review of the American Dinematichthyini (Teleostei: Bythitidae). Part I. Dinematichthys, Gunterichthys, Typhliasina and two new gerera. Aqua, J. Ichthy. Aquat. Biol. v. 8 (no. 4): 141-192 + front and back cover.
  • Gymnothorax hansi Heemstra, 2004
    Heemstra, P. C. 2004. Gymnothorax hansi, a new species of moray eel (Teleostei: Anguilliformes: Muraenidae) from the Comoro Islands, Western Indian Ocean. Zootaxa No. 515: 1-7.
  • Gymnotus ardilai Maldonado-Ocampo & Albert, 2004
    Maldonado-Ocampo, J. A. & J. S. Albert. 2004. Gymnotus ardilai: a new species of Neotropical electric fish (Ostariophysi: Gymnotidae) from the Rio Magdalena Basin of Colombia. Zootaxa No. 759: 1-10.
  • Hadropogonichthys leptopus Machida, Shinohara & Ohta, 2004
    Machida, Y., G. Shinohara & S. Ohta. 2004. A new deep-sea eelpout, Hadropogonichthys leptopus (Osteichthyes: Perciformes: Zoarcidae), from the Pacific Ocean off Japan. Species Diversity v. 9 (no. 3): 193-200.
  • Haplochromis ampullarostratus Schraml, 2004
    Schraml, E. 2004. Die Artenvielfalt der Fische in Ugandas Gewässern. Beiträge zur Kenntnis der Fischfauna Ugandas. Dtsch. Cichliden-Ges. Inf. Special No. 3: 2-48.
  • Haplochromis commutabilis Schraml, 2004
    Schraml, E. 2004. Die Artenvielfalt der Fische in Ugandas Gewässern. Beiträge zur Kenntnis der Fischfauna Ugandas. Dtsch. Cichliden-Ges. Inf. Special No. 3: 2-48.
  • Haplochromis exspectatus Schraml, 2004
    Schraml, E. 2004. Die Artenvielfalt der Fische in Ugandas Gewässern. Beiträge zur Kenntnis der Fischfauna Ugandas. Dtsch. Cichliden-Ges. Inf. Special No. 3: 2-48.
  • Haplochromis ushindi Van Oijen, 2004
    Van Oijen, M. J. P. 2004. Haplochromis ushindi spec. nov., the largest piscivorous cichlid in the Mwanza Gulf area of Lake Victoria (East Africa) before the Nile perch upsurg. Zool. Meded. (Leiden) v. 78: 249-255.
  • Harpagifer crozetensis Prirodina 2004
    Prirodina, V. P. 2004. Harpagifer crozetensis sp. nova (Harpagiferidae, Notothenioidei), a new species from the littoral of Crose [Crozet] Islands (Indian Ocean sector of the Antarctic). Voprosy Ikhtiol. v. 44 (no. 3): 419-423.
  • Hemiancistrus megalopteryx Cardoso, 2004
    Cardoso, A. R. 2004. Hemiancistrus megalopteryx, a new species of loricariid catfish from the rio Tubarão drainage, Santa Catarina State, Brazil (Teleostei; Siluriformes: Loricariidae). Ichthyol. Explor. Freshwaters v. 15 (no. 2): 173-178.
  • Hemiancistrus meizospilos Cardoso & da Silva, 2004
    Cardoso, A. R. & J. F. P. da Silva. 2004. Two new species of the genus Hemiancistrus Bleeker (Teleostei: Siluriformes: Loricariidae) from the upper rio Uruguai basin. Neotropical Ichthyol. v. 2 (no. 1): 1-8.
  • Hemiancistrus votouro Cardoso & da Silva, 2004
    Cardoso, A. R. & J. F. P. da Silva. 2004. Two new species of the genus Hemiancistrus Bleeker (Teleostei: Siluriformes: Loricariidae) from the upper rio Uruguai basin. Neotropical Ichthyol. v. 2 (no. 1): 1-8.
  • Hemiodus jatuarana Langeani, 2004
    Langeani, F. 2004. Hemiodus jatuarana, a new species of Hemiodontidae from the rio Trombetas, Amazon Basin, Brazil (Teleostei, Characiformes). Zootaxa No. 546: 1-6.
  • Hemitriakis complicofasciata Takahashi & Nakaya, 2004
    Takahashi, M. & K. Nakaya. 2004. Hemitriakis complicofasciata, a new whitefin topshark (Carcharhiniformes; Triakidae) from Japan. Ichth. Research v. 51 (no 3): 248-255.
  • Hippopotamyrus szaboi Kramer, van der Bank & Wink, 2004
    Kramer, B., H. van der Bank & M. Wink. 2004. Hippopotamyrus ansorgii species complex in the Upper Zambezi River System with a description of a new species, H. szaboi (Mormyridae). Zool. Scripta v. 33 (no. 1): 1-18.
  • Horaglanis alikunhii Subhash Babu & Nayar, 2004
    Subhash Babu, K. K. & C. K. G. Nayar. 2004. A new species of the blind fish Horaglanis Menon (Siluroidea: Clariidae) from Parappukara (Trichur District) and a new report of Horaglanis krishnai Menon from Ettumanur (Kottayam District), Kerala. J. Bombay Nat. Hist. Soc. v. 101 (no. 2): 296-298.
  • Hydrolagus matallanasi Soto & Vooren, 2004
    Soto, J. M. R. & C. M. Vooren, 2004. Hydrolagus matallanasi sp. nov. (Holocephali, Chimaeridae) a new species of rabbitfish from southern Brazil. Zootaxa No. 687: 1-10.
  • Hyphessobrycon auca Almirón, Casciotta, Bechara & Ruiz Diaz, 2004
    Almirón, A. E., J. R. Casciotta, J. A. Bechara & F. J. Ruiz Diaz. 2004. A new species of Hyphessobrycon (Charaaciformes, Characidae) from the Esteros del Iberá wetlands, Argentina. Rev. Suisse Zool. v. 111 (no. 3): 673-682.
  • Hyphessobrycon nigricinctus Zarske & Géry, 2004
    Zarske, A. & J. Géry. 2004. Hyphessobrycon nigricinctus sp. n. -- ein neuer Salmler (Teleostei: Characiformes: Characidae) aus dem Stromgebiet des río Madre de Dios in Peru. Zool. Abh., Staat. Mus. Tierk. Dresden v. 54: 31-38.
  • Chaetodontoplus vanderloosi Allen & Steene, 2004
    Allen, G. R. & R. C. Steene. 2004. Chaetodontoplus vanderloosi, a new species of angelfish (Pomacanthidae) from Papua New Guinea. Aqua, J. Ichthy. Aquat. Biol. v. 8 (no. 1): 23-30.
  • Chalceus epakros Zanata & Toledo-Piza, 2004
    Zanata, A. M. & M. Toledo-Piza. 2004. Taxonomic revision of the South American fish genus Chalceus Cuvier (Teleostei: Ostariophysi: Characiformes) with the description of three new species. Zool. J. Linn. Soc. No. 140: 103-135.
  • Chalceus guaporensis Zanata & Toledo-Piza, 2004
    Zanata, A. M. & M. Toledo-Piza. 2004. Taxonomic revision of the South American fish genus Chalceus Cuvier (Teleostei: Ostariophysi: Characiformes) with the description of three new species. Zool. J. Linn. Soc. No. 140: 103-135.
  • Chalceus spilogyros Zanata & Toledo-Piza, 2004
    Zanata, A. M. & M. Toledo-Piza. 2004. Taxonomic revision of the South American fish genus Chalceus Cuvier (Teleostei: Ostariophysi: Characiformes) with the description of three new species. Zool. J. Linn. Soc. No. 140: 103-135.
  • Chromis monochroma Allen & Randall, 2004
    Allen, G. R. & J. E. Randall. 2004. Two new species of damselfishes (Pomacentridae: Chromis) from Indonesian seas. Aqua, J. Ichthy. Aquat. Biol. v. 9 (no. 1): 17-24.
  • Chromis planesi Lecchini & Williams, 2004
    Lecchini, D. & J. T. Williams. 2004. Description of a new species of damselfish (Pomacentridae: Chromis) from Rapa Island, French Polynesia. Aqua, J. Ichthy. Aquat. Biol. v. 8 (no. 3): 97-102.
  • Chromis pura Allen & Randall, 2004
    Allen, G. R. & J. E. Randall. 2004. Two new species of damselfishes (Pomacentridae: Chromis) from Indonesian seas. Aqua, J. Ichthy. Aquat. Biol. v. 9 (no. 1): 17-24.
  • Icelinus limbaughi Rosenblatt & Smith, 2004
    Rosenblatt, R. H. & W. L. Smith. 2004. Icelinus limbaughi: a new species of sculpin (Teleostei: Cottidae) from southern California. Copeia 2004 (no. 3): 556-561.
  • Idiotropiscis lumnitzeri Kuiter, 2004
    Kuiter, R. H. 2004. A new pygmy pipehorse (Pisces: Syngnathidae: Idiotropiscis) from eastern Australia. Rec. Aust. Mus. v. 56 (no. 2): 163-165.
  • Ichthyapus insularis McCosker, 2004
    McCosker, J. E. 2004. A new species of finless snake eel (Anguilliformes: Ophichthidae) from Ascension Island, with comments on Ichthyapus acutirostris. Proc. Calif. Acad. Sci. v. 55 (no. 7): 169-173.
  • Ioichthys kashkini Parin, 2004
    Parin, N. V. 2004. A new mesopelagic fish Ioichthys kashkini Parin, gen. et sp. nova (Opisthoproctidae) from the northwestern part of the Indian Ocean. Voprosy Ikhtiol. v. 44 (no. 4): 437-440.
  • Ituglanis bambui Bichuette & Trajano, 2004
    Bichuette, M. E. & E. Trajano. 2004. Three new subterranean species of Ituglanis from central Brazil (Siluriformes: Trichomycteridae). Ichthyol. Explor. Freshwaters v. 15 (no. 3): 243-256.
  • Ituglanis epikarsticus Bichuette & Trajano, 2004
    Bichuette, M. E. & E. Trajano. 2004. Three new subterranean species of Ituglanis from central Brazil (Siluriformes: Trichomycteridae). Ichthyol. Explor. Freshwaters v. 15 (no. 3): 243-256.
  • Ituglanis ramiroi Bichuette & Trajano, 2004
    Bichuette, M. E. & E. Trajano. 2004. Three new subterranean species of Ituglanis from central Brazil (Siluriformes: Trichomycteridae). Ichthyol. Explor. Freshwaters v. 15 (no. 3): 243-256.
  • Katibasia insidiosa Kottelat, 2004
    Kottelat, M. 2004. On the Bornean and Chinese Protomyzon (Teleostei: Balitoridae), with descriptions of two new genera and two new species from Borneo, Vietnam and China. Ichthyol. Explor. Freshwaters v. 15 (no. 4): 301-310.
  • Kiunga bleheri Allen, 2004
    Allen, G. R. 2004. Kiunga bleheri, a new blue-eye (Pisces: Pseudomugilidae) from fresh waters of Papua New Guinea. Aqua, J. Ichthy. Aquat. Biol. v. 8 (no. 2): 79-85.
  • Knodus geryi Lima, Britski & Machado, 2004
    Lima, F. C. T., H. A. Britski & F. A. Machado. 2004. New Knodus (Ostariophysi: Characiformes: Characidae) from the upper Rio Paraguay basin, Brazil. Copeia 2004 (no. 3): 577-582.
  • Kolpotocheirodon figueiredoi Malabarba, Lima & Weitzman, 2004
    Malabarba, L. R., F. C. T. Lima & S. H. Weitzman. 2004. A new species of Kolpotocheirodon (Teleostei: Characidae: Cheirodontinae: Compsurini) from Bahia, northeastern Brazil, with a new diagnosis of the genus. Proc. Biol. Soc. Wash. v. 117 (no. 3): 317-329.
  • Kryptopterus piperatus Ng, Wirjoatmodjo & Hadiaty, 2004
    Ng, H. H., S. Wirjoatmodjo & R. K. Hadiaty. 2004. Kryptopterus piperatus, a new species of silurid catfish (Teleostei: Siluridae) from northern Sumatra. Ichthyol. Explor. Freshwaters v. 15 (no. 1): 91-95.
  • Kryptopterus platypogon Ng, 2004
    Ng, H. H. 2004. Kryptopterus platypogon, a new silurid catfish (Teleostei: Siluridae) from Borneo. Zootaxa No. 398: 1-8.
  • Kyphosus hawaiiensis Sakai & Nakabo, 2004
    Sakai, K. & T. Nakabo. 2004. Two new species of Kyphosus (Kyphosidae) and a taxonomic review of Kyphosus bigibbus Lacepède from the Indo-Pacific. Ichth. Research v. 51 (no. 1): 20-32.
  • Kyphosus pacificus Sakai & Nakabo, 2004
    Sakai, K. & T. Nakabo. 2004. Two new species of Kyphosus (Kyphosidae) and a taxonomic review of Kyphosus bigibbus Lacepède from the Indo-Pacific. Ichth. Research v. 51 (no. 1): 20-32.
  • Lamprologus teugelsi Schelly & Stiassny, 2004
    Schelly, R. C. & M. L. J. Stiassny. 2004. Revision of the Congo River Lamprologus Schilthuis, 1891 (Teleostei: Cichlidae), with descriptions of two new species. Am. Mus. Novit. No. 3451: 1-40.
  • Lamprologus tigripictilis Schelly & Stiassny, 2004
    Schelly, R. C. & M. L. J. Stiassny. 2004. Revision of the Congo River Lamprologus Schilthuis, 1891 (Teleostei: Cichlidae), with descriptions of two new species. Am. Mus. Novit. No. 3451: 1-40.
  • Leiognathus robustus Sparks & Dunlap, 2004
    Sparks, J. S. & P. V. Dunlap. 2004. A clade of non-sexually dimorphic ponyfishes (Teleostei: Perciformes: Leiognathidae): Phylogeny, taxonomy, and description of a new species. Am. Mus. Novit. No. 3459: 1-21.
  • Liparis zonatus Chernova, Stein & Andriashev, 2004
    Chernova, N. V., D. L. Stein & A. P. Andriashev. 2004. Family Liparidae Scopoli 1777 -- snailfishes. Calif. Acad. Sci. Annotated Checklists of Fishes No. 31: 1-72.
  • Lophiocharon hutchinsi Pietsch, 2004
    Pietsch, T. W. 2004. A new species of the anglerfish genus Lophiocharon Whitley (Lophiiformes: Antennariidae) from Australian waters. Rec. Aust. Mus. v. 56 (no. 2): 159-162.
  • Lopholiparis flerxi Orr, 2004
    Orr, J. W. 2004. Lopholiparis flerxi: a new genus and species of snailfish (Scorpaeniformes: Liparidae) from the Aleutian Islands, Alaska. Copeia 2004 (no. 3): 551-555.
  • Magadania skopetsi Shinohara, Nazarkin & Chereshnev, 2004
    Shinohara, S., M. Nazarkin & I. Chereshnev. 2004. Magadania skopetsi, a new genus and species of Zoarcidae (Teleostei: Perciformes) from the Sea of Okhotsk. Ichth. Research v. 51 (no. 2): 137-145.
  • Malakichthys similis Yamanoue & Matsuura, 2004
    Yamanoue, Y. & K. Matsuura. 2004. A review of the genus Malakichthys Döderlein (Perciformes: Acropomatidae) with the description of a new species. J. Fish Biol. v. 65 (no. 2): 511-529.
  • Manonichthys alleni Gill, 2004
    Gill, A. C. 2004. Revision of the Indo-Pacific dottyback fish subfamily Pseudochrominae (Perciformes: Pseudochromidae). Smithiana Monogr. No. 1: 1-213, Pls. 1-12.
  • Manonichthys winterbottomi Gill, 2004
    Gill, A. C. 2004. Revision of the Indo-Pacific dottyback fish subfamily Pseudochrominae (Perciformes: Pseudochromidae). Smithiana Monogr. No. 1: 1-213, Pls. 1-12.
  • Mastacembelus shiloangoensis (Vreven, 2004)
    Vreven, E. J. 2004. Aethiomastacembelus shiloangoensis, a new spiny-eel from the Shiloango River basin, Africa (Synbranchiformes: Mastacembelidae). Ichthyol. Explor. Freshwaters v. 15 (no. 2): 97-104.
  • Microcambeva ribeirae Costa, Lima & Bizerril, 2004
    Costa, W. J. E. M., S. M. Q. Lima & C. R. S. F. Bizerril. 2004. Microcambeva ribeirae sp. n. (Teleostei: Siluriformes: Trichomycteridae): a new sarcoglanidine catfish from the Rio Ribeira do Iguape basin, southeastern Brazil. Zootaxa No. 563: 1-10.
  • Micronemacheilus zispi Prokofiev 2004
    Prokofiev, A. M. 2004. A new species of the genus Micronoemacheilus Rendahl, 1944 (Balitoridae: Nemacheilinae) from Hainan (China) with notes on its status. Voprosy Ikhtiol. v. 44 (no. 3): 154-161.
  • Microsynodontis armatus Ng, 2004
    Ng, H. H. 2004. The Microsynodontis (Teleostei: Siluriformes: Mochokidae) of the lower Guinea region, west central Africa, with the description of eight new species. Zootaxa No. 531: 1-52.
  • Microsynodontis emarginatus Ng, 2004
    Ng, H. H. 2004. The Microsynodontis (Teleostei: Siluriformes: Mochokidae) of the lower Guinea region, west central Africa, with the description of eight new species. Zootaxa No. 531: 1-52.
  • Microsynodontis hirsutus Ng, 2004
    Ng, H. H. 2004. The Microsynodontis (Teleostei: Siluriformes: Mochokidae) of the lower Guinea region, west central Africa, with the description of eight new species. Zootaxa No. 531: 1-52.
  • Microsynodontis laevigatus Ng, 2004
    Ng, H. H. 2004. The Microsynodontis (Teleostei: Siluriformes: Mochokidae) of the lower Guinea region, west central Africa, with the description of eight new species. Zootaxa No. 531: 1-52.
  • Microsynodontis nannoculus Ng, 2004
    Ng, H. H. 2004. The Microsynodontis (Teleostei: Siluriformes: Mochokidae) of the lower Guinea region, west central Africa, with the description of eight new species. Zootaxa No. 531: 1-52.
  • Microsynodontis nasutus Ng, 2004
    Ng, H. H. 2004. The Microsynodontis (Teleostei: Siluriformes: Mochokidae) of the lower Guinea region, west central Africa, with the description of eight new species. Zootaxa No. 531: 1-52.
  • Microsynodontis notatus Ng, 2004
    Ng, H. H. 2004. The Microsynodontis (Teleostei: Siluriformes: Mochokidae) of the lower Guinea region, west central Africa, with the description of eight new species. Zootaxa No. 531: 1-52.
  • Microsynodontis vigilis Ng, 2004
    Ng, H. H. 2004. The Microsynodontis (Teleostei: Siluriformes: Mochokidae) of the lower Guinea region, west central Africa, with the description of eight new species. Zootaxa No. 531: 1-52.
  • Moema apurinan Costa, 2004
    Costa, W. J. E. M. 2004. Moema apurinan sp. n. and Aphyolebias boticarioi sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): two new annual killifishes from the Rio Purus basin, Brazilian Amazon. Zootaxa No. 707: 1-12.
  • Moenkhausia bonita Benine, Castro & Sabino, 2004
    Benine, R. C., R. M. C. Castro & J. Sabino. 2004. Moenkhausia bonita: a new small characin fish from the Rio Paraguay basin, southwestern Brazil (Characiformes: Characidae). Copeia 2004 (no. 1): 68-73.
  • Moenkhausia heikoi Géry & Zarske, 2004
    Géry, J. & A. Zarske. 2004. Moenkhausia heikoi n. sp., a new tetra (Teleostei: Ostariophysi: Characiformes: Characidae) from the Rio Xingú basin, Brazil, with a supplementary description of the genus type species. Aqua, J. Ichthy. Aquat. Biol. v. 9 (no. 1): 29-43.
  • Moenkhausia rara Zarske, Géry & Isbrücker, 2004
    Zarske, A., J. Géry & I. J. H. Isbrücker. 2004. Moenkhausia rara sp. n. -- eine neue, bereits bestands-gefährdete Salmler-Art (Teleostei: Characiformes: Characidae) aus Surinam und Französisch Guayana mit einer ergänzenden Beschreibung von M. simulata (Eigenmann in Pearson, 1924). Zool. Abh., Staat. Mus. Tierk. Dresden v. 54: 19-30.
  • Mystus armiger Ng, 2004
    Ng, H. H. 2004. New estuarine species of Mystus (Teleostei: Bagridae) from the Malay Peninsula. Copeia 2004 (no. 4): 883-887.
  • Myxiops aphos Zanata & Akama 2004
    Zanata, A. M. & A. Akama. 2004. Myxiops aphos, a new characid genus and species (Characiformes: Characidae) from the rio Lençóis, Bahia, Brazil. Neotropical Ichthyol. v. 2 (no. 2): 45-54.
  • Nannacara quadrispinae Staeck & Schindler, 2004
    Staeck, W. & I. Schindler. 2004. Nannacara quadrispinae sp. n. -- a new dwarf cichlid fish (Teleostei: Perciformes: Cichlidae) from the drainage of the Orinoco Delta in Venezuela. Zool. Abh., Staat. Mus. Tierk. Dresden v. 54: 155-161.
  • Nannocharax reidi Vari & Ferraris, 2004
    Vari, R. P. & C. J., Jr. Ferraris. 2004. A new species of Nannocharax (Characiformes: Distichodontidae) from Cameroon, with descriptions of contact organs and breeding tubercles in the genus. Proc. Biol. Soc. Wash. v. 117 (no. 4): 551-563.
  • Nans indefessus Mirande, Aguilera & Azpelicueta, 2004
    Mirande, J. M., G. Aguilera & M. D. Azpelicueta. 2004. A new genus and species of small characid (Ostariophysi, Characidae) from the upper río Bermejo basin, northwestern Argentina. Rev. Suisse Zool. v. 111 (no. 4): 715-728.
  • Neosebastes multisquamus Motomura, 2004
    Motomura, H. 2004. Revision of the scorpinofish genus Neosebastes (Scorpaeniformes: Neosebastidae), with descriptions of five new species. Indo-Pac. Fishes No. 37: 1-76, Pls. 1-2.
  • Notarius biffi Betancur-R. & Acero, 2004
    Betancur-R., R. & A. Acero P. 2004. Description of Notarius biffi n. sp. and redescription of N. insculptus (Jordan & Gilbert) (Siluriformes: Ariidae) from the eastern Pacific, with evidence of monophyly and limits of Notarius. Zootaxa No. 703: 1-20.
  • Nothobranchius hassoni Valdesalici & Wildekamp, 2004
    Valdesalici, S. & Wildekamp, R. H. 2004. A new species of the genus Nothobranchius Peters, 1868 from the Lufwa River basin, Katanga Province, Democratic Republic of Congo (Pisces, Cyprinodontiformes, Aplocheilidae). 241-251.
  • Notropis calabazas Lyons & Mercado-Silva, 2004
    Lyons, J. & N. Mercado-Silva. 2004. Notropis calabazas (Teleostei; Cyprinidae): new species from the Río Pánuco basin of central Mexico. Copeia 2004 (no. 4): 868-875.
  • Noturus gladiator Thomas & Burr, 2004
    Thomas, M. R. & B. M. Burr. 2004. Noturus gladiator, a new species of madtom (Siluriformes: Ictaluridae) from Coastal Plain streams of Tennessee and Mississippi. Ichthyol. Explor. Freshwaters v. 15 (no. 4): 351-368.
  • Ogilbichthys ferocis Møller, Schwarzhans & Nielsen, 2004
    Møller, P. R., W. Schwarzhans & J. G. Nielsen. 2004. Review of the American Dinematichthyini (Teleostei: Bythitidae). Part I. Dinematichthys, Gunterichthys, Typhliasina and two new gerera. Aqua, J. Ichthy. Aquat. Biol. v. 8 (no. 4): 141-192 + front and back cover.
  • Ogilbichthys haitiensis Møller, Schwarzhans & Nielsen, 2004
    Møller, P. R., W. Schwarzhans & J. G. Nielsen. 2004. Review of the American Dinematichthyini (Teleostei: Bythitidae). Part I. Dinematichthys, Gunterichthys, Typhliasina and two new gerera. Aqua, J. Ichthy. Aquat. Biol. v. 8 (no. 4): 141-192 + front and back cover.
  • Ogilbichthys kakuki Møller, Schwarzhans & Nielsen, 2004
    Møller, P. R., W. Schwarzhans & J. G. Nielsen. 2004. Review of the American Dinematichthyini (Teleostei: Bythitidae). Part I. Dinematichthys, Gunterichthys, Typhliasina and two new gerera. Aqua, J. Ichthy. Aquat. Biol. v. 8 (no. 4): 141-192 + front and back cover.
  • Ogilbichthys longimanus Møller, Schwarzhans & Nielsen, 2004
    Møller, P. R., W. Schwarzhans & J. G. Nielsen. 2004. Review of the American Dinematichthyini (Teleostei: Bythitidae). Part I. Dinematichthys, Gunterichthys, Typhliasina and two new gerera. Aqua, J. Ichthy. Aquat. Biol. v. 8 (no. 4): 141-192 + front and back cover.
  • Ogilbichthys microphthalmus Møller, Schwarzhans & Nielsen, 2004
    Møller, P. R., W. Schwarzhans & J. G. Nielsen. 2004. Review of the American Dinematichthyini (Teleostei: Bythitidae). Part I. Dinematichthys, Gunterichthys, Typhliasina and two new gerera. Aqua, J. Ichthy. Aquat. Biol. v. 8 (no. 4): 141-192 + front and back cover.
  • Ogilbichthys puertoricoensis Møller, Schwarzhans & Nielsen, 2004
    Møller, P. R., W. Schwarzhans & J. G. Nielsen. 2004. Review of the American Dinematichthyini (Teleostei: Bythitidae). Part I. Dinematichthys, Gunterichthys, Typhliasina and two new gerera. Aqua, J. Ichthy. Aquat. Biol. v. 8 (no. 4): 141-192 + front and back cover.
  • Ogilbichthys tobagoensis Møller, Schwarzhans & Nielsen, 2004
    Møller, P. R., W. Schwarzhans & J. G. Nielsen. 2004. Review of the American Dinematichthyini (Teleostei: Bythitidae). Part I. Dinematichthys, Gunterichthys, Typhliasina and two new gerera. Aqua, J. Ichthy. Aquat. Biol. v. 8 (no. 4): 141-192 + front and back cover.
  • Ompok platyrhynchus Ng & Tan, 2004
    Ng, H. H. & H. H. Tan. 2004. Ompok platyrhynchus, a new silurid catfish (Teleostei: Siluridae) from Borneo. Zootaxa No. 580: 1-11.
  • Oneirodes pietschi Ho & Shao, 2004
    Ho, H.-C. & K.-T. Shao. 2004. New species of deep-sea ceratioid anglerfish, Oneirodes pietschi (Lophiiformes: Oneirodidae), from the north Pacific Ocean. Copeia 2004 (No. 1): 74-77.
  • Opistognathus alleni Smith-Vaniz, 2004
    Smith-Vaniz, W. F. 2004. Descriptions of six new species of jawfishes (Opistognathidae: Opistognathus) from Australia. Rec. Aust. Mus. v. 56 (no. 2): 209-224.
  • Opistognathus elizabethensis Smith-Vaniz, 2004
    Smith-Vaniz, W. F. 2004. Descriptions of six new species of jawfishes (Opistognathidae: Opistognathus) from Australia. Rec. Aust. Mus. v. 56 (no. 2): 209-224.
  • Opistognathus reticeps Smith-Vaniz, 2004
    Smith-Vaniz, W. F. 2004. Descriptions of six new species of jawfishes (Opistognathidae: Opistognathus) from Australia. Rec. Aust. Mus. v. 56 (no. 2): 209-224.
  • Opistognathus seminudus Smith-Vaniz, 2004
    Smith-Vaniz, W. F. 2004. Descriptions of six new species of jawfishes (Opistognathidae: Opistognathus) from Australia. Rec. Aust. Mus. v. 56 (no. 2): 209-224.
  • Opistognathus stigmosus Smith-Vaniz, 2004
    Smith-Vaniz, W. F. 2004. Descriptions of six new species of jawfishes (Opistognathidae: Opistognathus) from Australia. Rec. Aust. Mus. v. 56 (no. 2): 209-224.
  • Opistognathus verecundus Smith-Vaniz, 2004
    Smith-Vaniz, W. F. 2004. Descriptions of six new species of jawfishes (Opistognathidae: Opistognathus) from Australia. Rec. Aust. Mus. v. 56 (no. 2): 209-224.
  • Optivus agastos Gomon, 2004
    Gomon, M. F. 2004. Two new species of roughy (Trachichthyidae: Optivus) from coastal waters of Southern Australia. Rec. Aust. Mus. v. 56 (no. 2): 173-178.
  • Optivus agrammus Gomon, 2004
    Gomon, M. F. 2004. Two new species of roughy (Trachichthyidae: Optivus) from coastal waters of Southern Australia. Rec. Aust. Mus. v. 56 (no. 2): 173-178.
  • Oreoglanis macronemus Ng, 2004
    Ng, H. H. 2004. Oreoglanis macronemus, a new species of glyptosternine catfish (Teleostei: Siluriformes: Sisoridae) from northern Laos. Raffles Bull. Zool. v. 52 (no. 1): 209-213.
  • Oryzias nebulosus Parenti & Soeroto, 2004
    Parenti, L. R. & B. Soeroto. 2004. Adrianichthys roseni and Oryzias nebulosus, two new ricefishes (Atherinomorpha: Beloniformes: Adrianichthyidae) from Lake Poso, Sulawesi, Indonesia. Ichth. Research v. 51 (no. 1): 10-19.
  • Otocinclus cocama Reis, 2004
    Reis, R. E. 2004. Otocinclus cocama, a new uniquely colored loricariid catfish from Peru (Teleostei: Siluriformes), with comments on the impact of taxonomic revisions to the discovery of new taxa. Neotropical Ichthyol. v. 2 (no. 3): 109-115.
  • Pachycara saldanhai Biscoito & Almeida, 2004
    Biscoito, M. & A. J. Almeida. 2004. New species of Pachycara Zugmayer (Pisces: Zoarcidae) from the Rainbow hydrothermal vent field (Mid-Atlantic Ridge). Copeia 2004 (no. 3): 562-568.
  • Parabathymyrus fijiensis Karmovskaya, 2004
    Karmovskaya, E. S. 2004. Benthopelagic bathyal conger eels of families Congridae and Nettastomatidae from the western tropical Pacific, with descriptions of ten new species. J. Ichthyol. v. 44 (Suppl. 1): S1-S32.
  • Paraheminodus kamoharai Kawai, Imamura & Nakaya, 2004
    Kawai, T., H. Imamura & K. Nakaya. 2004. A new species of armored sea robin, Paraheminodus kamoharai (Teleostei: Peristediidae), from the Philippines. Ichth. Research v. 51 (no. 2): 126-130.
  • Paraliparis vaillanti Chernova, 2004
    Chernova, N. V. 2004. A new species of snailfishes (Liparidae) Paraliparis vaillanti sp. nova from the northwestern Atlantic, with the redescription of a rare species Paraliparis edwardsi Vaillant. Voprosy Ikhtiol. v. 44 (no. 2): 149-153.
  • Paramyxine moki McMillan & Wisner, 2004
    McMillan, C. B. & R. L. Wisner. 2004. Review of the hagfishes (Mxyinidae, Myxiniformes) of the northwestern Pacific Ocean, with descriptions of three new species, Eptatretus fernholmi, Paramyxine moki, and P. walkeri. Zool. Studies v. 43 (no. 1): 51-73.
  • Paramyxine walkeri McMillan & Wisner, 2004
    McMillan, C. B. & R. L. Wisner. 2004. Review of the hagfishes (Mxyinidae, Myxiniformes) of the northwestern Pacific Ocean, with descriptions of three new species, Eptatretus fernholmi, Paramyxine moki, and P. walkeri. Zool. Studies v. 43 (no. 1): 51-73.
  • Paraulopus melanogrammus Gomon & Sato, 2004
    Gomon, M. F. & T. Sato. 2004. A new cucumberfish (Paraulopidae) of the Paraulopus nigripinnis complex from central eastern Australia. Rec. Aust. Mus. v. 56 (no. 2): 195-199.
  • Pareuchiloglanis macropterus Ng, 2004
    Ng, H. H. 2004. Two new glyptosternine catfishes (Teleostei: Sisoridae) from Vietnam and China. Zootaxa No. 428: 1-12.
  • Pareuchiloglanis rhabdurus Ng, 2004
    Ng, H. H. 2004. Two new glyptosternine catfishes (Teleostei: Sisoridae) from Vietnam and China. Zootaxa No. 428: 1-12.
  • Parioglossus galzini Williams & Lecchini, 2004
    Williams, J. T. & D. Lecchini. 2004. Parioglossus galzini, a new species of ptereleotrid dartfish from Rapa Island (Teleostei: Gobioidei: Ptereleotridae). Zootaxa No. 506: 1-8.
  • Parioglossus multiradiatus Keith, Bosc & Valade, 2004
    Keith, P., P. Bosc & P. Valade. 2004. A new species of Parioglossus (Gobioidei, Ptereleotridae) from Seychelles Islands. Cybium v. 28 (no. 4): 341-344.
  • Pelvicachromis rubrolabiatus Lamboj, 2004
    Lamboj, A. 2004. Pelvicachromis signatus and Pelvicachromis rubrolabiatus, two new cichlid species (Teleostei, Perciformes) from Guinea, West Africa. Zootaxa No. 454: 1-12.
  • Pelvicachromis signatus Lamboj, 2004
    Lamboj, A. 2004. Pelvicachromis signatus and Pelvicachromis rubrolabiatus, two new cichlid species (Teleostei, Perciformes) from Guinea, West Africa. Zootaxa No. 454: 1-12.
  • Periophthalmus darwini Larson & Takita, 2004
    Larson, H. K. & T. Takita. 2004. Two new species of Periophthalmus (Teleostei: Gobiidae: Oxudercinae) from northern Australia, and a re-diagnosis of Periophthalmus novaeguineaensis. The Beagle (Rec. Mus. Art Galleries N. Terr.) v. 20: 175-185.
  • Periophthalmus murdyi Larson & Takita, 2004
    Larson, H. K. & T. Takita. 2004. Two new species of Periophthalmus (Teleostei: Gobiidae: Oxudercinae) from northern Australia, and a re-diagnosis of Periophthalmus novaeguineaensis. The Beagle (Rec. Mus. Art Galleries N. Terr.) v. 20: 175-185.
  • Petrocephalus sullivani Lavoué, Hopkins & Kamdem Toham, 2004
    Lavoué, S., C. D. Hopkins & A. Kamden Toham. 2004. The Petrocephalus (Pisces, Osteoglossomorpha, Mormyridae) of Gabon, Central Africa, with description of a new species. Zoosystema v. 26 (no. 3): 511-535.
  • Pholidochromis cerasina Gill & Tanaka, 2004
    Gill, A. C. & H. Tanaka. 2004. Pholidochromis cerasina, a new species of pseudochromine dottyback fish from the west Pacific (Perciformes: Pseudochromidae). Proc. Biol. Soc. Wash. v. 117 (no. 1): 17-22.
  • Phyllorhinichthys balushkini Pietsch, 2004
    Pietsch, T. W. 2004. Revision of the deep-sea anglerfish genus Phyllorhinichthys Pietsch (Lophiiformes: Ceratioidei: Oneirodidae), with the description of a new species from the Atlantic Ocean. Copeia 2004 (no. 4): 797-803.
  • Pictichromis coralensis Gill, 2004
    Gill, A. C. 2004. Revision of the Indo-Pacific dottyback fish subfamily Pseudochrominae (Perciformes: Pseudochromidae). Smithiana Monogr. No. 1: 1-213, Pls. 1-12.
  • Pimelodella spelaea Trajano, Reis & Bichuette, 2004
    Trajano, E., R. E. Reis & M. E. Bichuette. 2004. Pimelodella spelaea: a new cave catfish from central Brazil, with data on ecology and evolutionary considerations (Siluriformes: Heptapteridae). Copeia 2004 (no. 2): 315-325.
  • Placidochromis acuticeps Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis acutirostris Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis argyrogaster Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis boops Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis borealis Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis communis Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis domirae Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis ecclesi Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis elongatus Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis fuscus Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis chilolae Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis intermedius Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis koningsi Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis lineatus Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis longirostris Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis longus Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis lukomae Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis macroceps Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis macrognathus Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis mbunoides Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis minor Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis minutus Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis msakae Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis nigribarbis Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis nkhatae Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis nkhotakotae Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis obscurus Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis ordinarius Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis orthognathus Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis pallidus Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis platyrhynchos Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis rotundifrons Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis trewavasae Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis turneri Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Placidochromis vulgaris Hanssens, 2004
    Hanssens, M. 2004. The deep-water Placidochromis species. Pp. 104-197 in: Snoeks, J. (ed). The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas. Species Diversity Lake Malawai: 1-360.
  • Poecilia rositae Meyer, Schneider, Radda, Wilde & Schartl, 2004
    Meyer, M. K., K. Schneider, A, C. Radda, B. Wilde & M. Schartl. 2004. A new species of Poecilia, subgenus Mollienesia, from upper río Cahabón system, Guatemala, with remarks on the nomenclature of Mollienesia petenensis Günther, 1866 (Teleostei: Cyprinodontiformes: Poeciliidae). Zool. Abh., Staat. Mus. Tierk. Dresden v. 54: 145-154.
  • Polypterus teugelsi Britz, 2004
    Britz, R. 2004. Polypterus teugelsi, a new species of bichir from the Upper Cross River system in Cameroon (Actinopterygii: Cladistia: Polypteridae). Ichthyol. Explor. Freshwaters v. 15 (no. 2): 179-186.
  • Pomacentrus aurifrons Allen, 2004
    Allen, G. R.   2004. Pomacentrus aurifrons, a new species of damselfish (Pomacentridae) from Melanesia. Zootaxa No. 399: 1-7.
  • Pomacentrus bipunctatus Allen & Randall, 2004
    Allen, G. R. & J. E. Randall. 2004. Two new species of damselfishes (Pomacentridae) from Micronesia. Aqua, J. Ichthy. Aquat. Biol. v. 9 (no. 2): 75-87.
  • Pomacentrus yoshii Allen & Randall, 2004
    Allen, G. R. & J. E. Randall. 2004. Two new species of damselfishes (Pomacentridae) from Micronesia. Aqua, J. Ichthy. Aquat. Biol. v. 9 (no. 2): 75-87.
  • Poropanchax stigmatopygus Wildekamp & Malumbres, 2004
    Wildekamp, R. H. & F. J. Malumbres. 2004. Identification of Micropanchax scheeli (Cyprinodontiformes: Poeciliidae: Aplocheilichthyinae) with the description of a new species of the genus Poropanchax. Cybium v. 28 (no. 1): 61-67.
  • Prorivulus auriferus Costa, 2004
    Costa, W. J. E. M.   2004. A new killifish genus and species from the coastal plains of northeastern Brazil (Teleostei: Cyprinodontiformes: Rivulidae). Zootaxa No. 642: 1-10.
  • Psednos rossi Chernova & Stein, 2004
    Chernova, N. V. & D. L. Stein. 2004. A remarkable new species of Psednos (Teleostei: Liparidae) from the western North Atlantic Ocean. Fish. Bull. v. 102 (no. 2): 245-250.
  • Pseudancistrus sidereus Armbruster, 2004
    Armbruster, J. W. 2004. Pseudancistrus sidereus a new species from southern Venezuela (Siluriformes: Loricariidae) with a redescription of Pseudancistrus. Zootaxa No. 628: 1-15.
  • Pseudobagarius meridionalis (Ng & Siebert, 2004)
    Ng, H. H. & D. J. Siebert. 2004. A new species of the catfish genus Akysis (Siluriformes: Akysidae) from southern Borneo. Zootaxa No. 733: 1-8.
  • Pseudogilbia sanblasensis Møller, Schwarzhans & Nielsen, 2004
    Møller, P. R., W. Schwarzhans & J. G. Nielsen. 2004. Review of the American Dinematichthyini (Teleostei: Bythitidae). Part I. Dinematichthys, Gunterichthys, Typhliasina and two new gerera. Aqua, J. Ichthy. Aquat. Biol. v. 8 (no. 4): 141-192 + front and back cover.
  • Pseudochromis alticaudex Gill, 2004
    Gill, A. C. 2004. Revision of the Indo-Pacific dottyback fish subfamily Pseudochrominae (Perciformes: Pseudochromidae). Smithiana Monogr. No. 1: 1-213, Pls. 1-12.
  • Pseudochromis aureolineatus Gill, 2004
    Gill, A. C. 2004. Revision of the Indo-Pacific dottyback fish subfamily Pseudochrominae (Perciformes: Pseudochromidae). Smithiana Monogr. No. 1: 1-213, Pls. 1-12.
  • Pseudochromis kristinae Gill, 2004
    Gill, A. C. 2004. Revision of the Indo-Pacific dottyback fish subfamily Pseudochrominae (Perciformes: Pseudochromidae). Smithiana Monogr. No. 1: 1-213, Pls. 1-12.
  • Pseudochromis lugubris Gill & Allen, 2004
    Gill, A. C. & G. R. Allen. 2004. Pseudochromis lugubris and P. tonozukai, two new dottyback fish species from the Indo-Australian Archipelago (Perciformes: Pseudochromidae: Pseudochrominae). Zootaxa No. 604: 1-12.
  • Pseudochromis madagascariensis Gill, 2004
    Gill, A. C. 2004. Revision of the Indo-Pacific dottyback fish subfamily Pseudochrominae (Perciformes: Pseudochromidae). Smithiana Monogr. No. 1: 1-213, Pls. 1-12.
  • Pseudochromis melanurus Gill, 2004
    Gill, A. C. 2004. Revision of the Indo-Pacific dottyback fish subfamily Pseudochrominae (Perciformes: Pseudochromidae). Smithiana Monogr. No. 1: 1-213, Pls. 1-12.
  • Pseudochromis mooii Gill, 2004
    Gill, A. C. 2004. Revision of the Indo-Pacific dottyback fish subfamily Pseudochrominae (Perciformes: Pseudochromidae). Smithiana Monogr. No. 1: 1-213, Pls. 1-12.
  • Pseudochromis tonozukai Gill & Allen, 2004
    Gill, A. C. & G. R. Allen. 2004. Pseudochromis lugubris and P. tonozukai, two new dottyback fish species from the Indo-Australian Archipelago (Perciformes: Pseudochromidae: Pseudochrominae). Zootaxa No. 604: 1-12.
  • Pseudopataecus taenianotus Johnson, 2004
    Johnson, J. W. 2004. Two new species and two new records of aploactinid fishes (Pisces: Scorpaeniformes) from Australia. Rec. Aust. Mus. v. 56 (no. 2): 179-188.
  • Pseudophoxinus laconicus Kottelat & Barbieri, 2004
    Kottelat, M. & R. Barbieri. 2004. Pseudophoxinus laconicus, a new species of minnow from Peloponnese, Greece, with comments on the west Balkan Pseudophoxinus species (Teleostei: Cyprinidae). Ichthyol. Explor. Freshwaters v. 15 (no. 2): 147-160.
  • Ptychochromoides itasy Sparks, 2004
    Sparks, J. S. 2004. A new and presumably extinct species of Ptychochromoides (Teleostei: Perciformes: Cichlidae) from central Madagascar. Zootaxa No. 524: 1-15.
  • Puntius ornatus Vishwanath & Laisram, 2004
    Vishwanath, W. & J. Laisram. 2004. Two new species of Puntius Hamilton-Buchanan (Cypriniformes: Cyprinidae) from Manipur, India, with an account of Puntius species from the state. J. Bombay Nat. Hist. Soc. v. 101 (no. 1): 130-137.
  • Qianlabeo striatus Zhang & Chen, 2004
    Zhang, E. & Y.-Y. Chen. 2004. Qianlabeo striatus, a new genus and species of Labeoninae from Guizhou Province, China (Teleostei: Cyprinidae). Hydrobiologia No. 527 (no. 1): 25-33.
  • Rhabdoblennius nigropunctatus Bath, 2004
    Bath, H. 2004. Revision of the genus Rhabdoblennius Whitley (Pisces: Blenniidae: Salariinae), with descriptions of two new species. Stuttg. Beitr. Naturk. Ser. A (Biol.) No. 669: 1-26.
  • Rhabdoblennius papuensis Bath, 2004
    Bath, H. 2004. Revision of the genus Rhabdoblennius Whitley (Pisces: Blenniidae: Salariinae), with descriptions of two new species. Stuttg. Beitr. Naturk. Ser. A (Biol.) No. 669: 1-26.
  • Rhamdia guasarensis DoNascimiento, Provenzano & Lundberg, 2004
    DoNascimiento, C., F. Provenzano & J. G. Lundberg. 2004. Rhamdia guasarensis (Siluriformes: Heptapteridae), a new species of cave catfish from the Sierra Perijá, northwestern Venezuela. Proc. Biol. Soc. Wash. v. 117 (no. 4): 564-574.
  • Rhinobatos nudidorsalis Last, Compagno & Nakaya, 2004
    Last, P. R., L. J. V. Compagno & K. Nakaya. 2004. Rhinobatos nudidorsalis, a new species of shovelnose ray (Batoidea: Rhinobatidae) from the Mascarene Ridge, central Indian Ocean. Ichth. Research v. 51 (no. 2): 153-158.
  • Rhinobatos sainsburyi Last, 2004
    Last, P. R. 2004. Rhinobatos sainsburyi n. sp. and Aptychotrema timorensis n. sp. -- two new shovelnose rays (Batoidea: Rhinobatidae) from the eastern Indian Ocean. Rec. Aust. Mus. v. 56 (no. 2): 201-208.
  • Rita macracanthus Ng, 2004
    Ng, H. H. 2004. Rita macracanthus, a new riverine catfish (Teleostei: Bagridae) from South Asia. Zootaxa No. 568: 1-12.
  • Rivulus amanapira Costa, 2004
    Costa, W. J. E. M. 2004. Rivulus uakti sp. n. and R. amanapira sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): two new species from the upper Rio Negro, Brazilian Amazon. Zootaxa No. 465: 1-12.
  • Rivulus caurae Radda, 2004
    Radda, A. C. 2004. Description of a new species of the rivuline genus Rivulus Poey, 1869 (Rivulidae, Osteichthyes) from Rio Caura, Bolivar State, Venezuela. Ann. Naturhist. Mus. Wien No. 105 B: 21-25.
  • Rivulus kirovskyi Costa, 2004
    Costa, W. J. E. M. 2004. Rivulus kirovskyi, a new killifish from the central Amazon, Brazil (Cyprinodontiformes: Rivulidae). Neotropical Ichthyol. v. 2 (no. 1): 9-12.
  • Rivulus simplicis Costa, 2004
    Costa, W. J. E. M. 2004. Rivulus simplicis n. sp. (Cyprinodontiformes: Rivulidae): A new killifish from the coastal plains of south-eastern Brazil. Aqua, J. Ichthy. Aquat. Biol. v. 8 (no. 3): 103-108.
  • Rivulus uakti Costa, 2004
    Costa, W. J. E. M. 2004. Rivulus uakti sp. n. and R. amanapira sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): two new species from the upper Rio Negro, Brazilian Amazon. Zootaxa No. 465: 1-12.
  • Rivulus uatuman Costa, 2004
    Costa, W. J. E. M. 2004. Rivulus uatuman sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): a new miniature killifish from the central Brazilian Amazon. Zootaxa No. 696: 1-8.
  • Roa australis Kuiter, 2004
    Kuiter, R. H. 2004. Description of a new species of butterflyfish, Roa australis, from northwestern Australia (Pisces: Perciformes: Chaetodontidae). Rec. Aust. Mus. v. 56 (no. 2): 167-171.
  • Romanogobio parvus Naseka & Freyhof, 2004
    Naseka, A. M. & J. Freyhof. 2004. Romanogobio parvus, a new gudgeon from River Kuban, southern Russia (Cyprinidae, Gobioninae). Ichthyol. Explor. Freshwaters v. 15 (no. 1): 17-23.
  • Salaria economidisi Kottelat, 2004
    Kottelat, M. 2004. Salaria economidisi, a new species of freshwater fish from Lake Trichonis, Greece, with comments on variation in S. fluviatilis (Teleostei: Blenniidae). Rev. Suisse Zool. v. 111 (no. 1): 121-137.
  • Samaris chesterfieldensis Mihara & Amaoka, 2004
    Mihara, E. & K. Amaoka. 2004. Pleuronectiform fishes from New Caledonian waters. Five species of the samaris genus Plagiopsetta and Samaras (Samaridae). Mem. Mus. Natl. Hist. Nat. No. 191: 611-635.
  • Samaris spinea Mihara & Amaoka, 2004
    Mihara, E. & K. Amaoka. 2004. Pleuronectiform fishes from New Caledonian waters. Five species of the samaris genus Plagiopsetta and Samaras (Samaridae). Mem. Mus. Natl. Hist. Nat. No. 191: 611-635.
  • Saurenchelys taiwanensis Karmovskaya, 2004
    Karmovskaya, E. S. 2004. Benthopelagic bathyal conger eels of families Congridae and Nettastomatidae from the western tropical Pacific, with descriptions of ten new species. J. Ichthyol. v. 44 (Suppl. 1): S1-S32.
  • Scartella poiti Rangel, Gasparini & Guimarães, 2004
    Rangel, C. A., J. L. Gasparini & R. Z. P. Guimarães. 2004. A new species of combtooth blenny Scartella Jordan, 1886 (Teleostei: Blenniidae) from Trindale Island, Brazil. Aqua, J. Ichthy. Aquat. Biol. v. 8 (no. 3): 89-96.
  • Scopeloberyx bannikovi Kotlyar, 2004
    Kotlyar, A. N. 2004. Revision of the genus Scopeloberyx (Melamphaidae). Part 2. Oligorakered species of the group S. robustus. Voprosy Ikhtiol. v. 44 (no. 6): 725-737.
  • Scopeloberyx pequenoi Kotlyar, 2004
    Kotlyar, A. N. 2004. Revision of the genus Scopeloberyx (Melamphaidae). Part 2. Oligorakered species of the group S. robustus. Voprosy Ikhtiol. v. 44 (no. 6): 725-737.
  • Scopeloberyx rossicus Kotlyar, 2004
    Kotlyar, A. N.   2004. Revision of the genus Scopeloberyx (Melamphaidae). Part 1. Multi-raker species of the group S. robustus. Voprosy Ikhtiol. v. 44 (no. 5): 581-598.
  • Scorpaena cocosensis Motomura, 2004
    Motomura, H. 2004. New species of scorpionfish, Scorpaena cocosensis (Scorpaeniformes: Scorpaenidae) from the Cocos Islands, Costa Rica, eastern Pacific Ocean. Copeia 2004 (no. 4): 818-824.
  • Scorpaena lacrimata Randall & Greenfield, 2004
    Randall, J. E. & D. W. Greenfield. 2004. Two new scorpionfishes (Scorpaenidae) from the South Pacific. Proc. Calif. Acad. Sci. v. 55 (no. 19): 384-394.
  • Scorpaenopsis eschmeyeri Randall & Greenfield, 2004
    Randall, J. E. & D. W. Greenfield. 2004. Two new scorpionfishes (Scorpaenidae) from the South Pacific. Proc. Calif. Acad. Sci. v. 55 (no. 19): 384-394.
  • Scorpaenopsis insperatus Motomura, 2004
    Motomura, H. 2004. Scorpaenopsis insperatus: a new species of Scorpionfish from Sydney Harbour, New South Wales, Australia (Scorpaeniformes: Scorpaenidae). Copeia 2004 (no. 3): 546-550.
  • Sebastes kiyomatsui Kai & Nakabo, 2004
    Kai, Y. & T. Nakabo. 2004. A new species of Sebastes (Scorpaeniformes: Scorpaenidae) from the Pacific coast of southern Japan. Ichth. Research v. 51 (no. 1): 5-9.
  • Schindleria brevipinguis Watson & Walker, 2004
    Watson, W. & H. J., Jr. Walker. 2004. The world's smallest vertebrate, Schindleria brevipinguis, a new paedomorphic species in the family Schindleriidae (Perciformes: Gobioidea). Rec. Aust. Mus. v. 56 (no. 2): 139-142.
  • Schismatogobius vanuatuensis Keith, Marquet & Watson, 2004
    Keith, P., G. Marquet & R. E. Watson. 2004. Schismatogobius vanuatuensis, a new species of freshwater goby form Vanuatu, South Pacific. Cybium v. 28 (no. 3): 237-241.
  • Schistura khugae Vishwanath & Shanta, 2004
    Vishwanath, W. & K. Sharma. 2004. Schistura khugae, a new replacement name for S. macrocephalus Vishwanath & Shanta, 2004 (Teleostei: Balitoridae). Ichthyol. Explor. Freshwaters v. 15 (no. 4): 330.
  • Schistura reticulata Vishwanath & Nebeshwar, 2004
    Vishwanath, W. & K. Nebeshwar Sharma. 2004. Schistura reticulata, a new species of balitorid loach from Manipur, India, with a redescription of S. chindwinica. Ichthyol. Explor. Freshwaters v. 15 (no. 4): 323-330.
  • Schistura spekuli Kottelat, 2004
    Kottelat, M. 2004. Schistura spekuli, a new species of cave fishes from northern Vietnam (Teleostei: Balitoridae). Ichthyol. Explor. Freshwaters v. 15 (no 2): 187-191.
  • Sicyopterus aiensis Keith, Watson & Marquet, 2004
    Keith, P., R. E. Watson & G. Marquet. 2004. Sicyopterus aiensis, a new species of freshwater goby (Gobioidei) from Vanuatu, South Pacific. Cybium v. 28 (no. 2): 111-118.
  • Sicyopterus punctissimus Sparks & Nelson, 2004
    Sparks, J. S. & D. W. Nelson. 2004. Review of the Malagasy sicydiine gobies (Teleostei: Gobiidae), with description of a new species and comments on the taxonomic status of Gobius lagocephalus Pallas, 1770. Am. Mus. Novit. No. 3440: 1-20.
  • Silurus duanensis Hu, Lan & Zhang, 2004
    Hu, X.-Y., J.-H. Lan & C.-G. Zhang. 2004. A new species of the genus Duanensis [sic] [Silurus] (Siluriformes, Siluridae) from Guangxi, China. Acta Zootaxon. Sin. v. 29 (no. 3): 586-590.
  • Simpsonichthys carlettoi Costa & Nielson, 2004
    Costa, W. J. E. M. & D. T. B. Nielsen. 2004. Simpsonichthys carlettoi (Cyprinodontiformes: Rivulidae) a new annual fish from the Rio São Francisco basin, north-eastern Brazil. Aqua, J. Ichthy. Aquat. Biol. v. 8 (no. 3): 125-130.
  • Simpsonichthys radiosus Costa & Brasil, 2004
    Costa, W. J. E. M. & G. C. Brasil. 2004. Simpsonichthys radiosus sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): a new annual killifish from the upper Rio Tocantins basin, central Brazil. Zootaxa No. 737: 1-7.
  • Simpsonichthys suzarti Costa, 2004
    Costa, W. J. E. M. 2004. Simpsonichthys suzarti sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): a new annual fish from the Rio Pardo floodplains, northeastern Brazil. Zootaxa No. 468: 1-7.
  • Sinocyclocheilus tianlinensis Zhou, Zhang & He, 2004
    Zhou, J., C.-G. Zhang & A.-Y. He. 2004. A new species of the genus Sinocyclocheilus from Guangxi, China (Cypriniformes, Cyprinidae). Acta Zootaxon. Sin. v. 29 (no. 3): 591-594.
  • Sinocyclocheilus xunlensis Lan, Zhao & Zhang, 2004
    Zhou, J., C.-G. Zhang & A.-Y. He. 2004. A new species of the genus Sinocyclocheilus from Guangxi, China (Cypriniformes, Cyprinidae). Acta Zootaxon. Sin. v. 29 (no. 3): 591-594.
  • Soleichthys maculosus Muchhala & Munroe, 2004
    Muchhala, N. & T. A. Munroe. 2004. A new species of Soleichthys (Soleidae: Pleuronectiformes) from tropical seas off northern Australia. Ichth. Research v. 51 (no. 1): 57-62.
  • Soleichthys oculofasciatus Munroe & Menke, 2004
    Muchhala, N. & T. A. Munroe. 2004. A new species of Soleichthys (Soleidae: Pleuronectiformes) from tropical seas off northern Australia. Ichth. Research v. 51 (no. 1): 57-62.
  • Soleichthys serpenpellis Munroe & Menke, 2004
    Muchhala, N. & T. A. Munroe. 2004. A new species of Soleichthys (Soleidae: Pleuronectiformes) from tropical seas off northern Australia. Ichth. Research v. 51 (no. 1): 57-62.
  • Steatogenys ocellatus Crampton, Thorsen & Albert 2004
    Crampton, W. G. R., D. H. Thorsen & J. S. Albert. 2004. Steatogenys ocellatus: a new species of neotropical electric fish (Gymnotiformes: Hypopomidae) from the lowland Amazon Basin. Copeia 2004 (No. 1): 78-91.
  • Sternopygus branco Crampton, Hulen & Albert, 2004
    Crampton, W. G., K. C. Hulen & J. S. Albert. 2004. Sternopygus branco: a new species of neotropical electric fish (Gymnotiformes: Sternopygidae) from the lowland Amazon basin, with descriptions of osteology, ecology, and electric organ discharges. Copeia 2004 (no. 2): 245-259.
  • Sunagocia sainsbury Knapp & Imamura, 2004
    Knapp, L. W. & H. Imamura. 2004. Sunagocia sainsburyi, a new flathead fish (Scorpaeniformes: Platycephalidae) from northwestern Australia. Proc. Biol. Soc. Wash. v. 117 (no. 4): 545-550.
  • Tetragonopterus lemniscatus Benine, Pelição & Vari, 2004
    Benine, R. C., G. Z. Pelição & R. P. Vari. 2004. Tetragonopterus lemniscatus (Characiformes: Characidae), a new species from the Corantijn river basin in Suriname. Proc. Biol. Soc. Wash. v. 117 (no. 3): 339-345.
  • Thymallus burejensis Antonov, 2004
    Antonov, A. L. 2004. A new species of grayling Thymallus burejensis sp. nova (Thymallidae) from the Amur basin. Voprosy Ikhtiol. v. 44 (no. 4): 441-451.
  • Tor yingjiangensis Chen & Yang, 2004
    Chen, Z.-M. & J.-X. Yang. 2004. A new species of he genus Tor from Yunnan, China (Teleostei: Cyprinidae). Environ. Biol. Fishes v. 70 (no. 2): 185-191.
  • Toxotes kimberleyensis Allen, 2004
    Allen, G. R. 2004. Toxotes kimberleyensis, a new species of archerfish (Pisces: Toxotidae) from fresh waters of Western Australia. Rec. Aust. Mus. v. 56 (no. 2): 225-230.
  • Trichomycterus caudofasciatus Alencar & Costa, 2004
    Alencar, A. R. & W. J. E. M. Costa. 2004. Description of two new species of the catfish genus Trichomycterus from southeastern Brazil (Siluriformes: Trichomycteridae). Zootaxa No. 744: 1-8.
  • Trichomycterus diabolus Bockmann, Casatti & de Pinna, 2004
    Bockmann, F. A., L. Casatti & M. C. C. de Pinna. 2004. A new species of trichomycterid catfish from the Rio Paranapanema basin, southeastern Brazil (Teleostei: Siluriformes), with comments on the phylogeny of the family. Ichthyol. Explor. Freshwaters v. 15 (no. 3): 225-242.
  • Trichomycterus giganteus Lima & Costa, 2004
    Lima, S. M. Q. & W. J. E. M. Costa. 2004. Trichomycterus giganteus (Siluriformes: Loricarioidea: Trichomycteridae): a new catfish from the Rio Guandu basin, southeastern Brazil. Zootaxa No. 761: 1-6.
  • Trichomycterus itacambirussu Triques & Vono, 2004
    Triques, M. L. & V. Vono. 2004. Thre new species of Trichomycterus (Teleostei: Siluriformes: Trichomycteridae) from the Rio Jequitinhonha basin, Minas Gerais, Brazil. Ichthyol. Explor. Freshwaters v. 15 (no. 2): 161-172.
  • Trichomycterus jequitinhonhae Triques & Vono, 2004
    Triques, M. L. & V. Vono. 2004. Thre new species of Trichomycterus (Teleostei: Siluriformes: Trichomycteridae) from the Rio Jequitinhonha basin, Minas Gerais, Brazil. Ichthyol. Explor. Freshwaters v. 15 (no. 2): 161-172.
  • Trichomycterus landinga Triques & Vono, 2004
    Triques, M. L. & V. Vono. 2004. Thre new species of Trichomycterus (Teleostei: Siluriformes: Trichomycteridae) from the Rio Jequitinhonha basin, Minas Gerais, Brazil. Ichthyol. Explor. Freshwaters v. 15 (no. 2): 161-172.
  • Trichomycterus maracaya Bockmann & Sazima, 2004
    Bockmann, F. A. & I. Sazima. 2004. Trichomycterus maracaya, a new catfish from the upper rio Paraná, southeastern Brazil (Siluriformes: Trichomycteridae), with notes on the T. brasiliensis species-complex. Neotropical Ichthyol. v. 2 (no. 2): 61-74.
  • Trichomycterus mboycy Wosiacki & Garavello, 2004
    Wosiacki, W. B. & J. C. Garavello. 2004. Five new species of Trichomycterus from the rio Iguaçu (rio Paraná basin), southern Brazil (Siluriformes: Trichomycteridae). Ichthyol. Explor. Freshwaters v. 15 (no. 1): 1-16.
  • Trichomycterus naipi Wosiacki & Garavello, 2004
    Wosiacki, W. B. & J. C. Garavello. 2004. Five new species of Trichomycterus from the rio Iguaçu (rio Paraná basin), southern Brazil (Siluriformes: Trichomycteridae). Ichthyol. Explor. Freshwaters v. 15 (no. 1): 1-16.
  • Trichomycterus pantherinus Alencar & Costa, 2004
    Alencar, A. R. & W. J. E. M. Costa. 2004. Description of two new species of the catfish genus Trichomycterus from southeastern Brazil (Siluriformes: Trichomycteridae). Zootaxa No. 744: 1-8.
  • Trichomycterus papilliferus Wosiacki & Garavello, 2004
    Wosiacki, W. B. & J. C. Garavello. 2004. Five new species of Trichomycterus from the rio Iguaçu (rio Paraná basin), southern Brazil (Siluriformes: Trichomycteridae). Ichthyol. Explor. Freshwaters v. 15 (no. 1): 1-16.
  • Trichomycterus plumbeus Wosiacki & Garavello, 2004
    Wosiacki, W. B. & J. C. Garavello. 2004. Five new species of Trichomycterus from the rio Iguaçu (rio Paraná basin), southern Brazil (Siluriformes: Trichomycteridae). Ichthyol. Explor. Freshwaters v. 15 (no. 1): 1-16.
  • Trichomycterus pseudosilvinichthys Fernández & Vari, 2004
    Fernández, L. & R. P. Vari. 2004. New species of Trichomycterus from midelevation localities of northwestern Argentina (Siluriformes: Trichomycteridae). Copeia 2004 (no. 4): 876-882.
  • Trichomycterus taroba Wosiacki & Garavello, 2004
    Wosiacki, W. B. & J. C. Garavello. 2004. Five new species of Trichomycterus from the rio Iguaçu (rio Paraná basin), southern Brazil (Siluriformes: Trichomycteridae). Ichthyol. Explor. Freshwaters v. 15 (no. 1): 1-16.
  • Trichomycterus trefauti Wosiacki, 2004
    Wosiacki, W. B. 2004. New species of the catfish genus Trichomycterus (Siluriformes, Trichomycteridae) from the headwaters of the rio São Francisco basin, Brazil. Zootaxa No. 592: 1-12.
  • Trimma agrena Winterbottom & Chen, 2004
    Winterbottom, R. & I-S. Chen. 2004. Two new species of Trimma (Teleostei: Gobiidae) from the western Pacific Ocean. Raffles Bull. Zool. Suppl. No. 11: 103-106.
  • Trimma cana Winterbottom, 2004
    Winterbottom, R. 2004. Three new species of Trimma (Pisces; Gobiidae) from the central, western and south Pacific. Aqua, J. Ichthy. Aquat. Biol. v. 9 (no. 1): 7-16.
  • Trimma fangi Winterbottom & Chen, 2004
    Winterbottom, R. & I-S. Chen. 2004. Two new species of Trimma (Teleostei: Gobiidae) from the western Pacific Ocean. Raffles Bull. Zool. Suppl. No. 11: 103-106.
  • Trimma sostra Winterbottom, 2004
    Winterbottom, R. 2004. Three new species of Trimma (Pisces; Gobiidae) from the central, western and south Pacific. Aqua, J. Ichthy. Aquat. Biol. v. 9 (no. 1): 7-16.
  • Trimma squamicana Winterbottom, 2004
    Winterbottom, R. 2004. Three new species of Trimma (Pisces; Gobiidae) from the central, western and south Pacific.