Crustacea, the Higher Taxa

J.K. Lowry


Anthuridea (Isopoda, Peracarida, Malacostraca)

Description. Head. Rostrum absent; eyes sessile; compound, visual elements present; ocular scale absent; naupliar eyes absent. Antennules (antenna 1) uniramous; peduncle and flagellum distinct; exopod well developed, whip-like; statocyst present. Antennae (antenna 2) uniramous; exopod multiarticulate. Mandible uniramous; palp present, or absent. Maxillipeds, 1 pair; uniramous. Thorax. Carapace absent. Thorax and abdomen differentiated. Peraeopods (legs) 7 pairs; uniramous; non-phyllopodous; differentiated (some prehensile). Peraeopod 1 (leg 1) subchelate. Peraeopod 2 (leg 2) simple. Peraeopod 3 (leg 3) simple. Abdomen with 6 somites. Epimera absent. Pleopods present, 5 pairs; well developed, broad and flat; first or second pair not modified into operculum, or first pair or first and second pair forming an operculum; pleopod 2 forming a gonopod (eg. appendix masculina) in males. Uropods well developed, 1 pair, positioned ventrolaterally; rami present, exopod with diaresis, partial or complete; endopod without statocyst. Telson present (not fused to pleon), or fused to pleon (pleotelson); with 1 or 2 statocysts at base, or without statocysts.

Larval development. Epimorphic. Embryos carried in ventral thoracic brood pouch.

Habitat. Marine, estuarine, freshwater.

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/.