Freshwater sleeper
Freshwater sleepers are a small family, the Odontobutidae, of gobiiform ray-finned fishes native to freshwater rivers flowing into the South China Sea and the northwestern Pacific Ocean. The family consists of about 22 species in six genera.
Genera
The following genera are currently recognised as being within the family Odontobutidae:Micropercops Fowler & Bean, 1920Neodontobutis I. S. Chen, Kottelat & H. L. Wu, 2002Odontobutis Bleeker, 1874Perccottus Dybowski, 1877Sineleotris Herre, 1940Terateleotris Shibukawa, Iwata & Viravong, 2001A single fossil genus is known, †Paralates Sauvage, 1883, from the Late Eocene of England and Early Oligocene of France. This genus was long considered an early gobioid of uncertain affinities, but a 2025 study, which also analyzed its otolith morphology, found it to be a stem-member of the Odontobutidae.