Anomia ephippium   Linnaeus,  1758 (Oyster)
Organism information awaits expert curation
Class: Bivalvia

Image copyrights: David Fenwick

Max. size: 6.0 cm SHL

Color: Shell white, occasionally with blue or pink tinge.

Anomia ephippium is an irregularly shaped bivalve with a thin shell, found attached to stones and to other bivalve shells. It is approximatelty circular. The right valve is lowermost and adjacent to the substratum, the left valve is uppermost. It attaches to the substratum by byssal threads though a hole in the right valve. The right valve often takes on an impression of the substratum and this is most obvious when an individual has been attached to a scallop. The edge of the left valve is often shaped to fit exactly onto the substratum. The left valve has irregular growth lines on its surface although these can be worn off in older individuals. Left valve has three muscle scars in the concavity of the shell. No hinge teeth. Anomia ephippium is distinguished from other saddle oysters (Anomiidae) by a line of three muscle scars on the inside surface of the convex valve.

Synonym (s)
Anomia adhaerens Clement, 1879
Anomia aspera Philippi, 1844
Anomia boletiformis Locard, 1891
Anomia cepa Linnaeus, 1758
Anomia cepiformis Locard, 1886
Anomia electrica Linnaeus, 1758
Anomia fornicata Lamarck, 1819
Anomia humphreysiana Reeve, 1859
Anomia huttoni Suter, 1913
Anomia lucerna Reeve, 1859
Anomia patellaris Lamarck, 1819
Anomia pellucida Brown, 1818
Anomia polymorpha Philippi, 1836
Anomia pyriformis Lamarck, 1819
Anomia radians O.G. Costa, 1844
Anomia radiata Brocchi, 1814
Anomia ramosa Reeve, 1859
Anomia scabrella Philippi, 1836
Anomia strigilis Reeve, 1859
Anomia sulcata Poli, 1795
Anomia tunicacepae da Costa, 1778
Anomia tyria Reeve, 1859
Anomia violacea Bruguiere, 1789

Common Name (s)
• Saddle Oyster (English)
Economic Importance and Threats

Habitat:  Coastal
Trophic Level:  Consumer
Prey:  Phytoplankton
Predator:  Diplodus sargus sargus, Diplodus vulgaris


• Gujarat, Veraval INDIA

Literature Source(s)
  • 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
  • Sealifebase Available at -
  • MarLIN: Marine life information network Biology and sensitivity key information sub-programme [on-line] Available at -
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Fenwick, D Aphotofauna Available at -
  • Bhagirathan, U; Panda, SK; Madhu, VR and Meenakumari, B (2008) Occurrence of live Octocorals in the Trawling Grounds of Veraval Coast of Gujarat, Arabian Sea Turkish Journal of Fisheries and Aquatic Sciences Central Fisheries Research Institute of Turkey and Japan 8 369-372 Available at -

Page last updated on:2011-02-23

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