Ceratocumatidae Calman 1905

Ceratocumatidae is a family of crustaceans of the order Cumacea. Ceratocumatidae have a small free telson. The endopods (interior branches) of the uropods are present on only one segment. Males have 5, 4 or 3 pairs of pleopods. All maxillipeds and some of the pereiopods bear exopods (outer branches). The gill apparatus has no supporting gill plates.

Telson present, small. Uropod inner ramus uniarticulate. Male pleopods 5, 4, or 3 pairs, with external process on inner ramus. Number free thoracic somites never reduced. Exopods on maxillipeds and the following combinations of pereopods: in the male, 1-4, rarely 1-3 or 1-2; in the female, 1,or 1-3, with some females showing 1 + 3 rudimentary early in development. Mandible with large section dorsal to molar. Branchial apparatus without gill plate or supports.