CERATOCUMIDAE
Cimmerius costlowi
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.