Decatopecten radula   (Linnaeus,  1758) (Scallop)
Organism information awaits expert curation
Class: Bivalvia

Image copyrights: Guido T. Poppe & Philippe Poppe - Conchology, Inc.

Size: Maximum shell height 9.5 cm, commonly to 7 cm.

Color: Outside of shell off-white to cream, with variable, dull brown concentric mottling on left valve, mainly on top of the main radial ribs. Interior is satin white, with dark brown on the hinge line.

Shell solid, medium sized, higher than long, elongate-ovate in outline. Both valves convex, the right (lower) valve more inflated than the left (upper) valve. Ears subequal in size and shape. Right anterior ear has a slight byssal notch anteroventrally, devoid of ctenolium. Outer sculpture of about 10 or 11 rounded radial folds (9 to 13) on each valve, with numerous, much smaller, secondary radial riblets that are set with densely and finely imbricated transverse scales, giving a rather strongly scabrous aspect. Surface of ears with distinct radial ridges (more developed on right anterior ear). Hinge line quite long, about 2/3 of shell length, with shallow marginal ridges. Interior of valves is shiny, with a flattened radial sculpture corresponding with the outer folds.

Synonym (s)
Comptopallium pauciplicatum Iredale, 1939
Comptopallium radula (Linnaeus, 1758)
Comptopallium radula griggi (Webb, 1957)
Pecten argenteus Reeve, 1853

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

Habitat:  Reef Associated, Rocky, Sandy



Literature Source(s)
  • 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 -
  • Poppe, GT and Poppe, P (1996) Conchology, Inc. Conchology, Inc. Available at -

Page last updated on:2010-05-24

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