DIASTYLIDAE
Diastylis pellucida
Diagnosis of the Diastylidae
Telson present, usually of medium or large size, occasionally small, usually with 2 terminal setae, rarely with none. Uropod inner ramus of 2 or 3, rarely 1 articles. Male pleopods 2 pairs, rarely 0, without 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 1-2; in the female, 2 or 2 + 2 rudimentary, rarely 0 or absent from the third maxillipeds and present on pereopods 1-2. Mandible usually naviculoid, with large section dorsal to molar, rarely truncate. Branchial apparatus with narrow or broad gill plates.