Home|Search|Identify|Taxonomic tree|Quiz|About this site|Feedback
Developed by ETI BioInformatics
Characteristics, distribution and ecology
Taxonomische classification
Synonyms and common names
Literature references
Images, audio and video
Links to other Web sites

Atlanta fragilis Richter, 1993

Overview

This is a medium sized dextrally shelled, pelagic snail, 0.8 cm in diameter with very large eyes and a single swimming fin. It is large, strongly flattened and keeled. The spire is very small, and like the rest of the shell, colourless. The operculum has a very small spire. It is a carnivore, predating on relatively large zooplankton. This species occurs in warm waters of the Atlantic Ocean (Atlanta fragilis).

Taxonomic Description [after Richter, 1993]

The shell is strongly flattened and has 6 whorls. The spire is small, without sculpture but with a clear suture. The umbilicus is relatively narrow and the keel is high. The fifth whorl is separated from the fourth one by a deep penetration of the keel in between the whorls. The shell is completely colourless, very thin and fragile. The eye lens is very large (twice as large as in Atlanta peroni). The radula formula is 2-1-1-1-2 with 70 transverse rows, the median teeth has a large median cusp, the additional teeth are smaller than the lateral teeth. In males the additional teeth are shortened. The laterals are broad and short.
Shell diameter up to 8.1 mm.

Juveniles

The juveniles have a small dextrally coiled shell. A special description is not available.

Reproduction

In this species the sexes are separate.

Ecology

This species is an epipelagic carnivore.

Distribution

This species occurs in the tropical central Atlantic.

Types

Atlanta fragilis Richter, 1993: 191, pl. 1, fig. 2, pl. 2, fig. 6, pl. 4, figs. 16, 17, 20.
Holotype SMF 309762 in SMFM. Paratypes: SMF 309763/5 in SMFM.
Type locality: Meteor 51 stat. 94, 0-50m depth.

Atlanta fragilis