Crustacea, the Higher Taxa

J.K. Lowry

Calanoida (Copepoda, Maxillipoda)

Description. Head. Rostrum present or absent; eyes absent; eyes naupliar eyes present, or naupliar eyes absent. Antennules (antenna 1) uniramous; geniculate in males; peduncle and flagellum indistinguishable; exopod well developed, whip-like, with 21-27 articles. Antennae (antenna 2) biramous; with 10 articles; endopod with 4 articles. Mandible biramous; palp present, or absent. Maxillipeds, 1 pair, or 2 pairs; uniramous. Thorax. Carapace absent. Thorax and abdomen differentiated, boundary between fifth pedigerous somite and genital somite (gymnoplean tagmosis). Peraeopods (legs) 5 pairs; biramous; non-phyllopodous; undifferentiated (simple); each article joined by intercoxal sclerite; anterior peraeopods (swimming legs) with 1 robust seta on outer margin of exopod article 1. Abdomen with 5 somites (or fewer). Epimera absent. Pleopods absent. Uropods well developed, 1 pair, positioned terminally or subterminally; rami absent; subrectangular to subquadrate. Telson absent.

Larval development. Metamorphic. Embryos carried in paired or single sacs attached to first abdominal somite, or eggs shed or deposited externally.

Habitat. Marine, brackish and freshwater, free-living, usually planktonic,.

Distribution. Worldwide.

Cite this publication as: Lowry, J.K. (1999 onwards). 'Crustacea, the Higher Taxa: Description, Identification, and Information Retrieval.' Version: 2 October 1999. http://crustacea.net/.