Třída: Actinopterygii - paprskoploutví
Řád: Anguilliformes - holobřiší
Čeleď: Synaphobranchidae - tupohlavcovití

Typový druh: Ilyophis brunneus Gilbert, 1891

Reference: Gilbert C. H. 1891. Descriptions of apodal fishes from the tropical Pacific. In: Scientific results of explorations by the U. S. Fish Commission steamer Albatross. Proc. U. S. Natl. Mus. v. 14 (no. 856). 347-352.

Přehled druhů

• Ilyophis arx Robins, 1976
  Tupohlavec tichooceánský
  Robins, C. H. & C. R. Robins 1976. New genera and species of dysommine and synaphobranchine eels (Synaphobranchidae) with an analysis of the Dysomminae. Proceedings of the Academy of Natural Sciences of Philadelphia v. 127: 249-280.
• Ilyophis blachei Saldanha & Merrett, 1982
  Tupohlavec Blacheův
  Saldanha, L. & N. R. Merrett. 1982. A new species of the deep-sea eel genus Ilyophis Gilbert (Synaphobranchidae) from the eastern North Atlantic, with comments on its ecology and intrafamilial relationships. Journal of Fish Biology v. 21 (no. 6): 623-636.
• Ilyophis brunneus Gilbert, 1891
  Tupohlavec hnědý
  Gilbert, C. H. 1891. Descriptions of apodal fishes from the tropical Pacific. In: Scientific results of explorations by the U. S. Fish Commission steamer Albatross. Proceedings of the United States National Museum v. 14 (no. 856): 347-352.
• Ilyophis nigeli Shcherbachev & Sulak, 1997
  
• Ilyophis robinsae Sulak & Shcherbachev, 1997
  
• Ilyophis saldanhai Karmovskaya & Parin, 1999
  

Statistické údaje

Počet druhů: 6