Tridacna crocea   Lamarck,  1819 (Clam)
Organism information awaits expert curation
Class: Bivalvia

Size: 150 mm in length

Color: Greyish white but often tinged with yellow or pinkish orange.

The shell is triangularly ovate in outline, angle formed at umbos by margins of hinge and ventral border usually usually less than 150º. It is moderately to strongly inflated and having an extremely large byssal orifice. Valves moderately heavy and thick. They are often encrusted with organisms and debris near free valve margins, but rubbed clean and nearly smooth ventrally. Dorsal valve margins are undulate. Hinge line short, less than half the shell length. A single oblong cardinal tooth is present in each valve. 2 elongate posterior lateral teeth are present in right valve and one in left. Hinge teeth are often somewhat obliterated by erosion of valves at umbos and encroachment of ligament. Ligament is secondarily prosodetic. Umbos are directed postero-medially. Ventral margin is slightly to moderately concave. Pallial line is entire and relatively wide.

It derives its nutrition mainly through photosynthesis, which is performed by zooxanthellae, a photosynthetic algae living symbiotically within the mantle of Tridacna crocea.

Synonym (s)
Tridacna (Chametrachea) crocea Lamarck, 1819

Common Name (s)
• Saffron Coloured Clam (English)
• Crocea Clam (English)
• Boring Clam (English)
• Crocus Giant Clam
Economic Importance and Threats
Importance:  Commercial
(Fisheries, aquarium. Collected for food and shell trade.)

Habitat:  Reef Associated, Demersal
Trophic Level:  Consumer
Prey:  Plankton


• Andaman and Nicobar Islands, Andaman Islands INDIA
• Karnataka, Netrani Island (Lat: 14) (Long: 74.32) INDIA (Record: 10/05/2006) (Depth: -(12-15) mts)
• Andaman and Nicobar Islands, North Reef Island INDIA
• 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
  • UNEP World Conservation Monitoring Centre Available at -
  • Tikader, BK and Das, AK (1985) Glimpses of animal life of Andaman and Nicobar Islands ZSI, Kolkata 1-170 Available at - NCL, Pune
  • Chantrapornsyl, S; Kittiwattanawong, K and Adulyanukosol, K (1996) Distribution and abundance of giant clam around Lee-Pae island, the Andaman sea, Thailand Phuket Marine Biological Center Special Publication 16 195-200 Available at - NCL, Pune
  • Fresh marine Available at -
  • Rosewater, J (1965) The family Tridacnidae in the Indo Pacific Indo-Pacific Mollusca Academy of Natural Sciences of Philadelphia, Pennsylvania 1(6) 347-408 Available at - NIO, Goa
  • Sealifebase 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 -
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Zacharia, PU; Krishnakumar, PK; Dineshbabu, AP; Vijayakumaran, K; Rohit, P; Thomas, S; Sasikumar, G; Kaladharan, P; Durgekar, RN and Mohamed, KS (2008) Species assemblage in the coral reef ecosystem of Netrani Island off Karnataka along the southwest coast of India Journal of the Marine Biological Association of India The Marine Biological Association of India, Cochin, India 50(1) 87-97 Available at - NIO, Goa
  • The age of aquariums Available at -
  • Rao, GC; Rao, DV and Devi, K (1994) A faunal exploration of the North Reef Island sanctuary, North Andaman Journal of the Andaman Science Association Andaman Science Association, Port Blair 10(1&2) 68-81 Available at - NIO, Goa
  • Rao, GC (1991) Distribution of plants and animals on the rocky sea shores of Andaman and Nicobar Islands Journal of the Andaman Science Association Andaman Science Association, Port Blair 7(2) 30-42 Available at - NIO, Goa

Page last updated on:2011-08-30

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