Placuna (Placuna) placenta   (Linnaeus)  1758 (Oyster)
Organism information awaits expert curation
Class: Bivalvia
Order:Pteriomorpha incertae sedis

Image copyrights: Government of India

Length 92.10-95.30 mm; width 89.80-92.25 mm; height 6-6.19 mm

Shell large, thin, flat, rounded and translucent, rather fragile, inner surface smooth, glossy and brilliant pearly appearance; outer surface with prominent growth lines and radial striae; adductor scar at the centre of the valve; umbo small, inconspicuous; cardinal teeth two, ridge-like, diverging from the umbo at a narrow angle; unequal and the posterior larger.

Synonym (s)
Anomia placenta Linnaeus 1758
Ephippium transparens Roding 1798
Placuna orbicularis Retzius 1758
Placuna ovalis Blainville 1826
Placenta orbicularis Retzius 1788

Common Name (s)
Economic Importance and Threats

Habitat:  Muddy, Coastal


• West Bengal, Palta INDIA (Record: 1938)
• West Bengal, Jharkhali INDIA (Record: 24/09/1984)
• West Bengal, Jambu Island INDIA (Record: 17/12/1987)
• West Bengal, North 24 Parganas INDIA (Record: 1992)
• West Bengal, South 24 Parganas INDIA (Record: 1992)
• Andaman and Nicobar Islands INDIA (Record: 1992)
• Andhra Pradesh INDIA (Record: 1992)
• Tamil Nadu INDIA (Record: 1992)
• Gulf of Aden (Record: 1992)

Literature Source(s)
  • OBIS Indo-Pacific molluscan database: Taxa reported from regions in India (W) Available at -
  • OBIS Indo-Pacific molluscan database Available at -
  • Subba Rao, NV; Dey, A and Barua, S (1992) Estuarine and marine molluscs Fauna of West Bengal Part 9 (State fauna series 3) ZSI, Calcutta 129-268 Available at - NIO, Goa
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -

Page last updated on:2009-05-27

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