Spondylus imperialis   Chenu,  1844 (Thorny Oyster)
Organism information awaits expert curation
Class: Bivalvia

Size: 13.5 cm SHH

Colour: Outer surface is pale pink; inner surface is smooth, pinkish white and glossy.

The shell is regular and the valves are slightly more flattened and more or less equal in size. The shell bears a characteristic and strongly developed sculpture consisting of six, widely spaced, thick, radial ribs carrying long, downwardly directed strong, stiff spines and three finer and weaker interstitial ribs in each of the interspaces between the main ribs, bearing much smaller, weaker and finer spines set almost perpendicular to the surface of the shell. The hinge has two very stout, protruding teeth in each valve which interlock strongly and effectively with no corresponding sockets in the opposite valve. The margin of the inner surface is toothed. The radial ribbing gives the edge of the valves a strongly undulating appearance in an end-view.

Synonym (s)
Spondylus imperialis var. purus Fulton, 1915
Spondylus ciliatus (non Sowerby) 1847
Spondylus nicobaricus ciliatus Habe, 1964

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

Habitat:  Reef Associated,Demersal


• Tamil Nadu, Parangipettai Coast (Lat: 11.48) (Long: 79.77) INDIA
• Tamil Nadu, Rameswaram Island INDIA
• Tamil Nadu, Gulf of Mannar (Lat: 78.13) (Long: 8.58) INDIA (Record: 01/1994-12/1995)
• Tamil Nadu, Gulf of Mannar (Lat: 79.5) (Long: 9.33) INDIA (Record: 01/1994-12/1995)

Literature Source(s)
  • (2002) Lakshadweep Islands biodiversity strategy and action plan (Version: 3)
  • Shanmugam, A; Rajagopal, S and Nazeer, RA Common bivalves of Parangipettai coast Available at - NIO, Goa
  • OBIS Indo-Pacific molluscan database Available at - http://clade.ansp.org/obis/find_mollusk.html
  • Nagabhushanam, AK and Krishnan, S (1993) Observations on the distribution of some of the marine organism inhabiting the inter-tidal zone along the western continental shelf of the Bay of Bengal, with particular reference to the Tamil Nadu coastal strip Records of the Zoological Survey of India 93(3-4) 449-490 Available at - ZSI, Pune
  • Allen, GR (2005) Reef fishes of northwestern Madagascar RAP Bulletin of Biological Assessment 31 39-48
  • Sealifebase Available at - http://www.sealifebase.org/
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org
  • 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 - http://www.fao.org/docrep/009/w7191e/w7191e00.htm
  • Sundaram, KS; Sarvesan, R; Mohamed, KH and Shanbhogue, SL (1969) Catalogue of molluscs, prawns, stomatopods and marine algae in the reference collections of the central marine fisheries research institute Bulletin Of Central Marine Fisheries Research Institute CMFRI, Cochin 9 1-52 Available at - http://eprints.cmfri.org.in/570/1/Bulletin_9.pdf
  • Hameed, PS and Somasundaram, SSN (1998) A survey of bivalve molluscs in Gulf of Mannar, India Indian Journal of Fisheries Indian journal of Fisheries for the Indian Council of Agricultural Research, Kochi, India 45(2) 177-181 Available at - http://epubs.icar.org.in/ejournal/index.php/IJF/article/download/8741/3650

Page last updated on:2012-03-07

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