Gnathypops Gill, 1862 Merogymnoides Whitley, 1966 Merogymnus Ogilby, 1908 Tandya Whitley, 1930 Upsilonognathus Fowler, 1946 Opistognathus is a genus of fish in the family Opistognathidae found in the Atlantic, Indian and Pacific Ocean.

[1] There are currently 72 recognized species in this genus: