Peraclis reticulata   (d'Orbigny)  1836 (Sea Snail)
Organism information awaits expert curation
Taxonomy
Kingdom:Animalia
Phylum:Mollusca
Class: Gastropoda
Order:Thecosomata
Family:Peraclidae

Image copyrights: L. Newman

Description
Size: Shell height up to 6 mm, mean diameter 3 mm.

Color: The shell is reddish or yellow.

The shell is relatively highly coiled and has 4 to 5 whorls with a relatively deep suture. The last whorl has a keel, but apertural teeth are lacking. Depending on age, faint radiating crests may develop along the suture. The aperture is rounded, a rostrum is present with a narrow columellar membrane. The shell is covered with reticulate sculpture composed of "cells" with 6, sometimes 4 or 5 corners; this sculpture disappears a short distance before the border of the aperture. The reticulate layer is not identical to a periostracum as it is composed of calcareous material. The umbilicus is very narrow or absent, the operculum has 5.5 whorls without radial striation. The radula formula is (1)-1-1-1-(1). Young specimens of about 2 mm have 3.5 whorls with an extension of the reticulum to the last whorl.
The juveniles have a small left coiled shell, and the reticulation starts directly after the protoconch I.

The two symmetrical, dorsal tentacles have a small eye each; on the short stalk a flattened disc is found covered with flat epithelium "the cornea"; the walls of the stalk are covered by a thick epithelium. The flat disc is composed of retinal tissue and a lumen below "the cornea" is filled with"lens" substance. The retinal cells are found on top of the optical ganglion under which cells with yellowish pigment form a pigmented body. As in most Thecosomata, the salivary glands are very simple and consist of two sacs with efferent ducts to the ventral side of the oesophagus. There are two cell types in these sacs: a large type with a large chromatine-rich nucleus secreting the glandular products and a small type in the more frontal gland section with oval nuclei and eosinophile secretion.

This species is a protandric hermaphrodite.


Synonym (s)

Common Name (s)
Economic Importance and Threats

Ecology

Biogeography


• Andaman Sea INDIA (Record: 05/2000)

Literature Source(s)
  • 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
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org
  • 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

Page last updated on:2010-01-07

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