Anomalocardia squamosa   (Linnaeus,  1758) (Clam)
Organism information awaits expert curation
Class: Bivalvia

Size: Maximum shell length 4.5 cm, commonly to 3 cm.

Color: Outside of shell dull yellowish white, often flushed with slightly darker grayish to purplish brown on lunule and escutcheon areas. Interior whitish.

Shell small, solid, inflated, strongly inequilateral in shape and subtrigonal in outline. Umbones thick and prominent, well anterior to mid-length of valves, on top of the strongly sloping anterodorsal and posterodorsal margins. Anterior side of shell rounded, posterior side produced and tapering to posterior end. Posteroventral margin slightly flexuous. Lunule broad and rounded, well defined by an incised peripheral groove, more shallowly sculptured than the main surface of shell. Posterodorsal slope depressed, set off by an obtuse ridge radiating from umbones to posterior end of shell and forming a shallow groove in front of it. Outer sculpture of valves strong, composed of dense radial riblets and low concentric cords, giving the surface a finely granulated and latticed aspect. Sculpture of posterodorsal slope obsolete, reduced to fine radial and concentric lines. Hinge plate trigonal, with 3 cardinal teeth at each valve, but without lateral teeth. Pallial sinus small and short, trigonal. Internal margins crenulated. Crenulations much smaller on dorsal margins, fading out at posterior end.

Synonym (s)
Anomalodiscus squamosus (Linnaeus, 1758)

Common Name (s)
Economic Importance and Threats
Importance:  Commercial
(Collected mainly for subsistence)

Habitat:  Sandy, Muddy



Literature Source(s)
  • 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 -
  • Mayhew, R Schooner specimen shells Available at -

Page last updated on:2012-09-17

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