Mactra maculata   Gmelin  1782 (Clam)
Organism information awaits expert curation
Class: Bivalvia

Size: Maximum shell length 7.5 cm, commonly to 6 cm.

Color: Outside of shell cream-colored, with irregular tan mottling and dots. Periostracum straw colored, translucent. Interior porcelaneous white, with dark brown blotch on posterior end.

Shell inflated, trigonal-ovate and relatively high in outline, nearly closed. Umbones are a little in front of midline of valves. Dorsal margin is strongly sloping on either side of umbo. Anterior margin rounded, posterior margin obtusely truncate. Outside of shell is smoothish, with an obscure ridge radiating from umbones to posteroventral end. Periostracum thin and adherent, somewhat wrinkled marginally. Lateral hinge teeth well developed, 1 anterior and 1 posterior in left valve, 2 anterior and 2 posterior in right valve. Pallial sinus shallow and widely open, higher than long.

Synonym (s)
Mactra maculata Chemnitz, 1785
Mactra reevei Reeve, 1854
Mactra squalida Lamarck, 1818
Mactra nebulosa Bory de Saint-Vincent, 1827

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

Habitat:  Sandy


• Andaman and Nicobar Islands, Andamans INDIA
• Andaman and Nicobar Islands, Chidiya Tapu INDIA
• Andaman and Nicobar Islands, Havelock (Lat: 11.97) (Long: 93) INDIA
• Andaman and Nicobar Islands, Camorta INDIA
• Andaman and Nicobar Islands, Nancowry Island (Lat: 7.98) (Long: 93.53) 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
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • 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 -

Page last updated on:2012-07-25

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