Otothyropsis biamnicus[1][2] is a species of catfish in the family Loricariidae.

It is noted to be commensal with midge larvae of the family Chironomidae, which attach to the gill openings or more rarely the cleithrum of the fish.

It reaches 4 cm (1.6 inches) SL.

The specific epithet of this species, biamnicus, roughly translates to "inhabitant of two rivers", which refers to the species' distribution in tributaries of two different rivers.

This article relating to Otothyrinae is a stub.