Microsynodontis nasutus is a species of upside-down catfish endemic to Gabon where it occurs in the Ogowe River.

[3] The genus Microsynodontis is restricted to the rivers of western Africa (from the Saint Paul River drainage south and east to the Congo River drainage), and comprises small mochokid catfishes diagnosed by the following synapomorphies: a narrow mesethmoid, lack of free orbital margin, transverse ventral fold of branchiostegal membranes, slender cleithral process, and a rounded or truncate caudal fin (Howes, 1980).

[4] M. nasutus is a small fish, reaching a maximum standard length of 3.7 centimeters (1.5 in).

[5] M. nasutus can be distinguished from other members of the genus Microsynodontis by examining the length of the snout.

Annals and Magazine of Natural History (Series 7),16, 36–6 Roberts, T. R. (1989) Systematic revision and description of new species of suckermouth catfishes (Chiloglanis, Mochokidae) from Cameroun.