Ruditapes variegatus   (Sowerby,  1852) (Clam)
Organism information awaits expert curation
Class: Bivalvia

Size: Maximum shell length 6 cm, commonly to 4.5 cm.

Colour: Outside variable, cream to fawn, brown or grey, uniform or variegated with various patterns of lighter or darker colours. Umbones frequently hued in pink, yellow, orange, or deep purplish blue. Interior often brightly tinged in yellow, pink, orange, purple, or light bluish grey, paler towards the margins and with deep purple blotches on hinge area.

Shell rather strong, with a variable, moderately inflated shape, generally relatively long for its height, elongate-ovate to subquadrate in outline. Umbones low, markedly anterior to midline of shell. Posterodorsal margin moderately long, becoming more strongly sloping towards the rounded posterior end of shell. Anterior and ventral margins rounded, the latter more broadly so. Lunule smoothish, long and narrow (about 3 to 4 times longer than wide), with fine peripheral groove. Escutcheon narrow and often moderately deep, well marked on both valves. Outer sculpture both concentric and radial, more pronounced anteriorly and posteriorly, giving a finely latticed and granulated characteristic pattern. Hinge with 3 cardinal teeth at each valve, but without lateral teeth. Pallial sinus well developed and rounded, about as high as long, but far from attaining mid-length of valves. Internal margins smooth.

Synonym (s)
Paphia (Amygdala) var.iegata Preston, 1852
Tapes var.iegata Sowerby, 1852
Tapes cinerea Deshayes, 1853
Tapes punicea Deshayes, 1853
Tapes variegata Sowerby, 1852
Venerupis variegata (Sowerby, 1852)
Tapes bruguieri (Hanley, 1845)
Tapes japonica Deshayes, 1853

Common Name (s)
Economic Importance and Threats
Importance:  Commercial
(Locally collected for food)
Cultured:  Yes

Habitat:  Sandy


• Andaman and Nicobar Islands, Andamans INDIA
• Andaman and Nicobar Islands, Chidiya Tapu INDIA
• Andaman and Nicobar Islands, Havelock (Lat: 11.97) (Long: 93) INDIA
• Andaman and Nicobar Islands, Port Blair (Lat: 11.67) (Long: 92.75) INDIA
• Andaman and Nicobar Islands, Car Nicobar (Lat: 9.17) (Long: 92.78) 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
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • 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 -
  • Mayhew, R Schooner specimen shells Available at -

Page last updated on:2012-11-23

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