Třída: Chondrichthyes - paryby
Řád: Carcharhiniformes - žralouni
Čeleď: Triakidae - hladkounovití

Typový druh: Squalus mustelus Linnaeus, 1758

Reference: Linck H. F. 1790. Versuch einer Eintheilung der Fische nach den Zähnen. Mag. Neueste Phys. Naturgesch. v. 6 (no. 3). 28-38.

Přehled druhů

• Mustelus albipinnis Castro-Aguirre, Atuna-Mendiola, Gonzáz-Acosta & Cruz-Aguero, 2005
  Pérez Jiménez, J. C., O. S. Nichizaki & J. L. Castillo Geniz. 2005. A new eastern North Pacific smoothhound shark (genus Mustelus, family Triakidae) from the Gulf of California. Copeia 2005 (no. 4): 834-845.
• Mustelus antarcticus Günther, 1870
  
• Mustelus asterias Cloquet, 1821
  Hladkoun hvězdnatý
  Cloquet, H. 1816-30. [Pisces accounts.] In: Dictionnaire des sciences naturelles. Volumes 1-60. [Initials after accounts correspond to authors given in Vol. 1; fish accounts by Lacepède (L. L.), Duméril (C. D.), Daudin (F. M. D.) and Cloquet (H. C.)]. Dict. Sci. Nat.
• Mustelus californicus Gill, 1864
  
• Mustelus canis (Mitchill, 1815)
  Hladkoun psí
  Mitchill, S. L. 1815. The fishes of New York described and arranged. Trans. Lit. Phil. Soc. N. Y. v. 1: 355-492, Pls. 1-6.
• Mustelus dorsalis Gill, 1864
  
• Mustelus fasciatus (Garman, 1913)
  
• Mustelus griseus Pietschmann, 1908
  
• Mustelus henlei (Gill, 1863)
  Hladkoun hnědý
  Gill, T. N. 1863. On the classification of the families and genera of the Squali of California. Proc. Acad. Nat. Sci. Phila. v. 14: 483-501.
• Mustelus higmani Springer & Lowe, 1963
  
• Mustelus lenticulatus Phillipps, 1932
  
• Mustelus lunulatus Jordan & Gilbert, 1882
  
• Mustelus manazo Bleeker, 1854
  
• Mustelus mento Cope, 1877
  
• Mustelus minicanis Heemstra, 1997
  
• Mustelus mosis Hemprich & Ehrenberg, 1899
  
• Mustelus mustelus (Linnaeus, 1758)
  Hladkoun obecný
  Linnaeus, C. 1758. Systema Naturae, Ed. X. (Systema naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Tomus I. Editio decima, reformata.) Holmiae. Systema Nat. ed. 10 v. 1: i-ii + 1-824.
• Mustelus norrisi Springer, 1939
  
• Mustelus palumbes Smith, 1957
  
• Mustelus punctulatus Risso, 1827
  Hladkoun černoskvrnný
  Risso, A. 1827. Histoire naturelle des principales productions de l'Europe méridionale, et particulièrement de celles des environs de Nice et des Alpes maritimes. F. G. Levrault, Paris & Strasbourg. Hist. Nat. Europe Mérid. v. 3: i-xvi + 1-480, Pls. 1-16.
• Mustelus ravidus White & Last, 2006
  White, W.T. & Last, P.R. 2006. Description of two new species of smooth-hounds, Mustelus widodoi and M. ravidus (Carcharhiniformes: Triakidae) from the western central Pacific. Cybium, 30 (3): 235-246.
• Mustelus schmitti Springer, 1939
  Hladkoun Schmittův
  Springer, S. 1939. Two new Atlantic species of dog sharks, with a key to the species of Mustelus. Proc. U. S. Natl. Mus. v. 86 (no. 3058): 461-468.
• Mustelus sinusmexicanus Heemstra, 1997
  
• Mustelus whitneyi Chirichigno F, 1973
  
• Mustelus widodoi White & Last, 2006
  White, W.T. & Last, P.R. 2006. Description of two new species of smooth-hounds, Mustelus widodoi and M. ravidus (Carcharhiniformes: Triakidae) from the western central Pacific. Cybium, 30 (3): 235-246.

Statistické údaje

Počet druhů: 25