Siliqua radiata   (Linnaeus,  1758) (Clam)
Organism information awaits expert curation
Class: Bivalvia
Order:[unassigned] Euheterodonta

Image copyrights: Bisyogai Database

Size: Length 30.05-39.85 mm; width 11-14.10 mm; height 4.10-5.15 mm

Color: Bluish white or bluish violet

The shell is fairly large, thin, rather fragile, compressed markedly, elongate and transversely oblong in outline. It is strongly inequilateral, the umbo being placed much nearer the anterior end. The surface of the shell is smooth, but on close examination it is seen to be finely grooved with concentric striae and much fainter radial striae. the ligament is external. One of the most characteristic features of this shell is the presence of a stout whitish radial ridge on the inner surface of each valve extending slightly obliquely down from the umbo and corresponding in position to the first white radial band on the outer surface. The inner surface is smooth and more glossy than the outer. The shell is bluish white or bluish violet, ornamented with four white radially expanding bands radiating from the umbo simulating the rays of the setting sun. It is to this last character that the shell owes its popular name "sunset shell".

Synonym (s)
Solen radiata Linnaeus, 1758
Siliqua radiata Rajagopal, Mookherjee & Mitra, 1980
Tellina vespertina Perry, 1811

Common Name (s)
• Sunset Siliqua
• Sunset Shell (English)
Economic Importance and Threats

Habitat:  Demersal, Rocky, Sandy, Coastal


• West Bengal, Medinipur INDIA
• West Bengal, Digha INDIA (Record: 10/03/1966)
• West Bengal, Digha beach (Lat: 21.65) (Long: 87.63) INDIA
• Tamil Nadu, Parangipettai Coast (Lat: 11.48) (Long: 79.77) INDIA
• Andhra Pradesh INDIA
• Gujarat INDIA
• Kerala INDIA
• Maharashtra INDIA
• Orissa INDIA
• Tamil Nadu INDIA
• Maharashtra, Versova INDIA (Record: 06/2008-08/2008)
• Tamil Nadu, Vedalai INDIA
• West Bengal, Digha Coast INDIA
• Tamil Nadu, Porto Novo (Lat: 11.48) (Long: 79.77) INDIA

Literature Source(s)
  • Tikadar, BK; Daniel, A and Subbarao, NV (1986) Sea shore animals of Andaman and Nicobar Islands The Director, ZSI, Kolkatta 188 Available at - ZSI, Pune
  • Apte,D (1998) The book of Indian shells Oxford University Press 115
  • 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
  • Venkatraman, K; Srinivasan, M; Satyanarayana, CH and Prabhakar D (2002) Faunal diversity of Gulf of Mannar biosphere reserve Conservation area series 15 ZSI 77 pp; VIII pla Available at - NCL, Pune
  • Shanmugam, A; Rajagopal, S and Nazeer, RA Common bivalves of Parangipettai coast Available at - NIO, Goa
  • Ramakrishna; Sarkar, J and Talukdar, S (2003) Marine invertebrates of Digha coast and some recomendations on their conservation Records of the Zoological Survey of India ZSI, Kolkata 101(3-4) 1 Available at - NCL, Pune
  • Chandrasekhara, G and Mishra, A (1986) The meiofauna and macrofauna of Digha beach, West Bengal, India Records of the Zoological Survey of India ZSI, Kolkata 83(3-4) Available at - NCL, Pune
  • 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
  • Ray, HC (1977) Contribution to the knowledge of the molluscan fauna of Maungmagan, Lower Burma (with descriptions of one new genus and species of the Family Turridae (Gastropoda) 8) Contribution to the knowledge of the molluscan fauna of Maungmagan, Lower Burma (with descriptions of one new genus and species of the Family Turridae (Gastropoda) 8) Indian Museum, Calcutta 1-150 Available at - Zoological Records (Burma marine)
  • Sealifebase 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 -
  • (1999) Bisyogai Database Available at -
  • Sundaram, S; Deshmukh, VD and Raje, SG (2010) Population eruption of sunset shell Siliqua radiata (Linnaeus, 1758) along Versova beach in Mumbai Journal of the Marine Biological Association of India Cochin 52(1) 99-101 Available at -
  • 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 -
  • Dey, M and Mitra, A (2005) Molluscan community around Digha coast, West Bengal, India Journal of Environment and Sociobiology Social Environmental and Biological Association, Kolkata, India 2(1&2) 43-47 Available at - NIO, Goa
  • Jayabal, R and Kalyani, M (1989) Check list of estuarine and marine bivalves of Porto Novo waters Mahasagar NIO, Goa 22(3) 147-150 Available at - NIO,Goa

Page last updated on:2012-01-30

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