Idotea emarginata   (Fabricius,  1793) (Isopod)
Organism information awaits expert curation
Class: Malacostraca

Image copyrights: Steve Trewhella

Size: Length from 7 to 30 mm (male) and from 9 to 18 mm (female).

Color: Males brown in color, occasionally with white markings. Females generally darker but with white bands along the sides of the body or alternating white and darker transverse bands.

A dorso-ventrally flattened crustacean with an elongated rounded oblong shaped, oval body. The distinct head bears two dorso-lateral eyes, a pair of short antennules, and a pair of antennae. Most of body is taken up by a thorax composed on seven sections (somites). The body ends in a short abdomen (two somites) and a distinct tail-piece (the pleotelson). The pleotelson in adults is characteristic, with slightly convex sides and a posterior end that is rounded in juveniles but bears two side processes in the adult giving a notched or emarginate appearance. Coxal plates broad, extending over the whole length of the somites 2 or 3 to 7. Pleotelson with sides slightly convex, posterior border emarginate.

Synonym (s)
Cymothoa emarginata Fabricius, 1793
Idotea emarginata massiliensis Gourret, 1891
(Junior synonym)
Idotea excisa Bosc, 1802
(Junior synonym)

Common Name (s)
Economic Importance and Threats

Habitat:  Demersal


• Palk Bay INDIA
• Tamil Nadu, Gulf of Mannar (Lat: 8.5) (Long: 79) INDIA

Literature Source(s)
  • Jordan, DS and JO, Snyder (1900) A list of fishes collected in Japan by Keinosuke Otaki and by the United States steamer albatross, with descriptions of fourteen new species Proceedings of U.S. National Museum 23(1213) 335-380
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Sealifebase Available at -
  • MarLIN: Marine life information network Biology and sensitivity key information sub-programme [on-line] Available at -
  • Naylor, E (1972) British marine isopods Academic press London and New York 3 86pp Available at - NIO, Goa

Page last updated on:2011-08-29

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