Hyalocylis striata   (Rang,  1828) (Sea Snail)
Organism information awaits expert curation
Class: Gastropoda

Image copyrights: Mike's Seashell Collection

Size: Shell length is about 8 mm.

Shell is curved faintly dorsally, fragile and cylindrical. The cross section of the shell is circular. The embryonic shell is thrown off in adults and a closing membrane is formed near the place of rupture. The concave closing membrane is punctuated at the surface. The embryonic portion leaves a completely circular mark at the top of the adult shell. The adult shell is transversely striated by broad, thickened bands. The distance between the successive bands increases towards the aperture. The shell is round in cross-section. The Hyalocylis striata radula formula is 1-1-1. The rear angle of the adult shell is 24°. Juveniles are not frequently reported from the plankton, and adults with parts of the protoconch attached to the shell are extremely rare. The juvenile consists of an oval protoconch I that is somewhat narrower posteriorly than anteriorly. A gradual incision separates the protoconch I from II. There is no difference in structure or shape between protoconch II and teleoconch. In juveniles, above the protoconch I, the shell is broad conical and shows about 8 transverse rings of the same type as in the adult shell. At the end of the larval stage a septum is formed that separates the adult shell from the protoconch which is later lost. Only a round mark of the protoconch is left at the caudal end of the shell. The soft parts develop through a skinny or minute stage into the adult.

The species is a protandric hermaphrodite.

Synonym (s)

Common Name (s)
Economic Importance and Threats

Habitat:  Demersal


• Andaman and Nicobar Islands, Andaman (Lat: 10) (Long: 93) INDIA
• Andaman and Nicobar Islands, Car Nicobar (Lat: 9.17) (Long: 92.78) INDIA
• Andaman Sea INDIA (Record: 05/2000)

Literature Source(s)
  • 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 - http://www.marinespecies.org
  • Sealifebase Available at - http://www.sealifebase.org/
  • Bhattacharjee, D (2005) Pteropod preservation profiles in seabed sediments off Middle Andaman Island in Andaman Sea Indian Journal of Marine Sciences CSIR 34(3) 259-266 Available at - http://nopr.niscair.res.in/handle/123456789/1561
  • van der Spoel, S; Newman, LJ and Estep, KW Pelagic molluscs Marine Species Idenification Portal Available at - http://www.species-identification.org/species.php?species_group=pelagic_molluscs&menuentry=colofon
  • Eddie, H Hardy's internet guide to marine gastropods Available at - http://www.gastropods.com/

Page last updated on:2010-06-30

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