Třída: Actinopterygii - paprskoploutví
Řád: Ophidiiformes - hrujovci
Čeleď: Bythitidae - jeskyňovkovití

Typový druh: Oligopus ater Risso, 1810

Reference: Goode, G. B. & T. H. Bean 1896. Oceanic ichthyology, a treatise on the deep-sea and pelagic fishes of the world, based chiefly upon the collections made by the steamers Blake, Albatross, and Fish Hawk in the northwestern Atlantic, with an atlas containing 417 figures. Spec. Bull. U. S. Natl. Museum No. 2: Text: i-xxxv + 1-26 + 1-553, Atlas: i-xxiii, 1-26, 123 pls.

Přehled druhů

• Grammonus ater (Risso, 1810)
  
• Grammonus claudei (Torre y Huerta, 1930)
  
• Grammonus diagrammus (Heller & Snodgrass, 1903)
  
• Grammonus longhursti (Cohen, 1964)
  
• Grammonus robustus Smith & Radcliffe, 1913
  
• 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.
• Grammonus waikiki (Cohen, 1964)
  
• Grammonus yunokawai Nielsen, 2007
  Nielsen, J.G. 2007. Grammonus yunokawai (Ophidiiformes: Bythitidae), a new marine cavefish from the Ryukyu Islands. Ichthyological Research, 54 (4): 374-379.

Statistické údaje

Počet druhů: 8