Mactra mera [Status Unaccepted]   Reeve,  1854 (Clam)
Organism information awaits expert curation
Class: Bivalvia

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

Color: Outside of shell purplish brown, with lighter and darker radial and concentric bands, and tinged deep purple on umbones. Periostracum brownish. Interior purple, often with a lighter grayish hue on hinge and umbonal cavity.

Shell moderately inflated, subtrigonal in outline, nearly closed. Umbones somewhat in front of midline of valves. Dorsal margin markedly sloping on either side of umbo. Anterior margin narrowly rounded, posterior margin subangulate. Posterodorsal slope of valves set off by a smooth angulation radiating from umbones to posteroventral end. Outside of shell smooth, but for concentric grooves on lunule and escutcheon areas. Periostracum thin and adherent, mainly persisting on periphery of shell. Lateral hinge teeth well developed, 1 anterior and 1 posterior in left valve, 2 anterior and 2 posterior in right valve. Pallial sinus broad and rounded, moderately shallow nearly as high as long.

Synonym (s)
Mactra grandis (non Gmelin, 1791)
Mactra antiquata Reeve, 1854
(Junior synonym)
Mactra mera Deshayes, 1855
Mactra grandis Gmelin, 1791

Common Name (s)
Economic Importance and Threats
Importance:  Commercial

Habitat:  Demersal,Sandy


• West Bengal, Digha Coast (Lat: 21.61) (Long: 87.53) INDIA
• Tamil Nadu, Parangipettai Coast (Lat: 11.48) (Long: 79.77) INDIA
• Andhra Pradesh, Lawsons Bay INDIA (Record: 09/1986-05/1988)
• Tamil Nadu, Gulf of Mannar (Lat: 78.13) (Long: 8.58) INDIA (Record: 01/1994-12/1995)
• Tamil Nadu, Gulf of Mannar (Lat: 79.5) (Long: 9.33) INDIA (Record: 01/1994-12/1995)

Literature Source(s)
  • Shanmugam, A; Rajagopal, S and Nazeer, RA Common bivalves of Parangipettai coast Available at - NIO, Goa
  • OBIS Indo-Pacific molluscan database Available at -
  • Ramakrishna; Sarkar, J and Talukdar, S (2003) Marine invertebrates of Digha coast and some recomendations on their conservation Records of the Zoological Survey of India ZSI, Kolkata 101(3-4) 1 Available at - NCL, Pune
  • Goswami, BCB (1992) Marine fauna of Digha coast of West Bengal, India Journal of Marine Biological Association of India The Marine Biological Association of India, Cochin 34 115-137 Available at - NIO, RC Kochi
  • 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 -
  • Sealifebase Available at -
  • Available at -
  • Raman, AV and Adiseshasai, K (1989) Macrobenthos from littoral areas off Visakhapatnam, east coast of India Indian Journal of Marine Sciences Scientific Publishers 18(4) 265-269 Available at - NIO, Goa
  • Hameed, PS and Somasundaram, SSN (1998) A survey of bivalve molluscs in Gulf of Mannar, India Indian Journal of Fisheries Indian journal of Fisheries for the Indian Council of Agricultural Research, Kochi, India 45(2) 177-181 Available at -

Page last updated on:2012-03-09

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