Marcusenius thomasi (Boulenger 1916)

The head, some parts of the body and the end of the dorsal and anal fins are darker in coloration. The whole body is generally brown. Dorsal fin origin behind anal fin origin, dorsal base/anal base rates = 0.5-0.6. LS/body depth ratio = 3.5-4.5. Long caudal peduncle, length/depth ratio = 2.9-5.5.

Dorsal spines (total): 0; Dorsal soft rays (total): 22 - 27; Analspines: 0; Analsoft rays: 37 - 43

Benthic feeder. Feeds on aquatic invertebrates (Ref. 36297).

Affinities: close to M. mento and M. furcidens.

Marcusenius thomasi is a species of ray-finned fish in the family Mormyridae. It is found in Guinea, Guinea-Bassau, Liberia, and Sierre Leone. Its natural habitats are rivers, intermittent rivers, and freshwater lakes. It is threatened by Mining and deforestation.