Spirula spirula   (Linnaeus,  1758) (Squid)
Organism information awaits expert curation
Class: Cephalopoda

Size: Diameter at the narrowest 1.5 mm and broadest part 6 mm; maximum width of the entire spiral is 20 mm.

Color: Shell whitish throughout.

Shell tubular and coiled spirally, the tube getting gradually wider from the centre of the coil towards th periphery. It is rather fragile, with a smooth surface. The shell is divided into a series of chambers by septa with their concave surfaces facing away from the narrower extremity of the shell; the surface of the septum is smooth and pearly. The positions of the septa are indicated on the external surface of the shell by opaque whitish or pale yellowish rings at which the surface is slightly depressed.

Synonym (s)
Nautilus spirula Linnaeus, 1758
Spirula australis Lamarck, 1816
Spirula fragilis Lamarck, 1801
Spirula peroni Lamarck, 1822
Spirula prototypus Peron, 1804

Common Name (s)
• Ram's Horn (English)
• Ram's Horn Shell (English)
• Ram's Horn Squid (English)
Economic Importance and Threats

Habitat:  Pelagic, Coastal


• Tamil Nadu, Dhanushkodi INDIA
• Tamil Nadu, Mandapam INDIA
• Tamil Nadu, Krusadai Island (Lat: 9.23) (Long: 79.22) INDIA
• Tamil Nadu, Pamban (Lat: 9.29) (Long: 79.21) INDIA

Literature Source(s)
  • Samuel, VD; Chacko, D and Edward, JKP (2005) Preliminary study on the molluscan diversity of “the lost world’’– Dhanushkodi, east coast of India Proceedings of the National Seminar on Reef Ecosystem Remediation SDMRI Special Research Publication No.9 54-58 Available at - http://www.sdmri.org/reports/proceedings%202005%20-%20sdmri.pdf
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org
  • The M.A.D. pages Available at - http://www.jandmgrist.com/index.html
  • 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
  • Satyamurti, ST (1956) The Mollusca of Krusadai island in the Gulf of Mannar II.- Scaphopoda, Pelecypoda and Cephalopoda Bulletin of the Madras Government 1(2) 202 pp Available at - NIO, Goa

Page last updated on:2013-01-21

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