Genus Cerapus Say, 1817

Diagnosis.

Body subcylindrical. Rostrum produced. Antenna 1 peduncle article 1 expanded, wider than articles 2–3. Mandibular palp reaching beyond incisor process, tri-articulate. Coxae 1–4 discontinuous. Gnathopod 1 subchelate. Male gnathopod 2 carpochelate. Female gnathopod 2 subchelate, lacking stout setae. Pereopod 5 geniculate at merus; merus posteroventral margin produced. Pereopod 7 longer than pereopod 6. Pleopods 2 and 3 inner ramus shorter than outer. Uropod 1 inner ramus shorter than outer ramus. Uropods 2 and 3 uniramous. Telson cleft.