Nerita (Theliostyla) planospira   Anton,  1839 (Sea Snail)
Organism information awaits expert curation
Class: Gastropoda

Shell size : 31 mm in height.

Color: yellowish-gray with maculations or zigzag striations of brownish-black, aperture yellowish white, columellar callus yellowish-white with a long blotch of black on its upper half, outer lip fringed with black and an yellowish-white interior. Operculum purplish, white near the nucleus, internal surface flesh-red; whitish anterior end and yellowish posterior end.

Shell of medium size, angularly semiglobose, flattened above with an obtuse shoulder angle, whorls three, narrow, compressed at the spire, broadly expanded at the aperture, spire very small, flatly impressed, sutures not distinct. Aperture with even columellar callus, granulated at the upper half and just below it a shallow depression bearing granules, columellar margin with four broad based and unequal projecting teeth, a ridge-like elevation in between the superior-most tooth and the posterior part of outer lip; outer lip thickened and broadly effused, slightly wavy in outline, inner side smooth with very faint ndications of teeth. Sculptured with 20 to 25 elevated, rounded and spiral ribs alternating frequently with narrow, thread-like riblets.

Synonym (s)

Common Name (s)
Economic Importance and Threats



• Andaman and Nicobar Islands, Andaman (Lat: 10) (Long: 93) INDIA
• Andaman and Nicobar Islands, Nicobar Islands (Lat: 7) (Long: 93) INDIA
• Andaman and Nicobar Islands, Chidiya Tapu INDIA
• Andaman and Nicobar Islands, Neil Island (Lat: 11.83) (Long: 93.05) INDIA
• Andaman and Nicobar Islands, Camorta INDIA
• Andaman and Nicobar Islands, Nancowry Island (Lat: 7.98) (Long: 93.53) INDIA

Literature Source(s)
  • Arrow, GJ (1910) The fauna of India including Ceylon and Burma. Coleoptera Taylor and Francis, Red Lion Court, Fleet Street 322 pp
  • Daniel, R (1985) Fauna of India and the adjacent countries (Coelenterata: Hydrozoa: Siphonophora) ZSI 440 pp Available at - NIO, Goa
  • Subba Rao, NV (2003) Indian seashells Records of the Zoological Survey of India ZSI, Kolkata (Part 1) 416 pp Available at - NCL, Pune
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • 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

Page last updated on:2012-06-29

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