Pinctada radiata   (Leach,  1814) (Oyster)
Organism information awaits expert curation

Outside of shell variable, uniform or with darker markings or radial rays, mostly of reds and browns, but sometimes of green and bronze coloration.Internal nacreous area highly iridescent. Non-nacreous margin glossy, light brown with dark brown or reddish blotches corresponding to the main external rays.

Shell rather thin and small to medium sized, relatively inflated, subquadrate in outline, with a short and ill defined posterior ear which is not drawn out into a wing-like process. Dorsal margin relatively long, anterior margin protruding only slightly or not at all beyond the tip of anterior ear. Outer surface of shell, when not worn, with densely set, appressed and flattened, imbricating concentric scales and moderately small, radially projecting spines mostly preserved towards the margins.

Hinge line with 2 small teeth in each valve: 1 rounded anterior tubercle just in front of the umbo, and 1 posterior ridge, situated behind the ligamental area and almost parallel to dorsal margin. A small accessory ridge sometimes present above the posterior tooth of right valve.

Synonym (s)

Common Name (s)
• Rayed Pearl Oyster (English)
Economic Importance and Threats
Importance:  Commercial
(Edible muscle, nacreous shell and has ability to develop pearls.)



• Andhra Pradesh, Kakinada Bay INDIA

Literature Source(s)
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Bouillon, S; Raman, AV; Dauby, P and Dehairs, F (2002) Carbon and Nitrogen stable isotope ratios of subtidal benthic invertebrates in an estuarine mangrove ecosystem (Andhra Pradesh, India) Estuarine, Coastal and Shelf Science. Elsevier 54 901–913 Available at -
  • Sealifebase Available at -

Page last updated on:2010-12-02

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