Arca ventricosa   Lamarck,  1819 (Clam)
Organism information awaits expert curation
Class: Bivalvia

Image copyrights: Moorea Biocode

Size: Maximum shell length 9 cm, commonly to 7 cm.

Color: Outside of shell often encrusted with marine growths. Posterior half dark brown, anterior half creamy white with zebra-like brown stripes. Inner side more or less strongly tinged with dark brown.

Shell equivalve, thick and inflated, very inequilateral, posteriorly expanded. Shape somewhat irregular, elongate and rectangular in outline, with strongly protruding umbones anteriorly and a broad rounded keel from umbones to posteroventral margin. Posterior margin obliquely truncate, ventral margin slightly sinuous with a well-developed byssal gape. Cardinal area wide and flattish, meeting the commissural plane nearly at right angle. Outer sculpture of numerous fine radial riblets crossed by irregular growth marks, and a few larger radial ribs on posterodorsal slope. Periostracum coarsely pilose, mainly persisting towards shell margins. Hinge straight very long and narrow. Internal margins smooth.

Synonym (s)
Arca truncata (Sowerby, 1839)
Arca zebra (Swainson, 1833)

Common Name (s)
Economic Importance and Threats
Importance:  Commercial
(Edible. Locally collected for shellcraft.)

Habitat:  Reef Associated, Rocky


• Andaman and Nicobar Islands INDIA

Literature Source(s)
  • Tikadar, BK; Daniel, A and Subbarao, NV (1986) Sea shore animals of Andaman and Nicobar Islands The Director, ZSI, Kolkatta 188 Available at - ZSI, Pune
  • Subba Rao, NV and Dey, A (2000) Catalogue of marine molluscs of Andaman and Nicobar Islands Occasional paper no 187 Records of the Zoological Survey of India ZSI 1-323 Available at - NCL, Pune
  • Allen, GR (2005) Reef fishes of northwestern Madagascar RAP Bulletin of Biological Assessment 31 39-48
  • Poutiers, JM (1998) Bivalves FAO species identification guide for fishery purposes. The living marine resources of the western central Pacific. Volume 1: Seaweeds, corals, bivalves and gastropods FAO, Rome 1 686 pp Available at -
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Sealifebase Available at -
  • CalPhotos Available at -

Page last updated on:2010-05-20

Back to Search