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Taxon profile

species

Emarginula icosisculpta L.R.L. Simone & C.M. Cunha, 2014

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Lepetellida »  family Fissurellidae - Keyhole Limpets »  genus Emarginula

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Emarginula icosisculpta

Author: Simone & Cunha

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Description

Diagnosis. Apex pointed, posterior located, turned posteriorly. Height 32% of length. Sculptured by ca. 20 strong radial cords, with interspaces regularly filled by commarginal sculpture as transverse scales.
Description. Shell size ca.2.5 mm; low. limpet-like; height ca.32% of length. White, opaque. Protoconch of 1.5 rounded whorls; somewhat protruding, located laterally, situated on right in posterior edge of apex; smooth, glossy; ca. 4% of total shell size. Slit anterior, rectangular, width 16% of length; 7% of shell width, 27% of shell length; edges rather irregular. Profile highly curved ventrally, sagittal profile in arc with imaginary center located ca. 50% of shell length ventral to highest shell region. Sculpture of strong radial cords, ca. 20 surrounding apex; gradually increasing in strength towards aperture; interspaces half of cords' width, filled by comarginal sculpture as transverse scales; interval between comarginal sculpture ca. 1/2 of thread's width, ca. 20 scales along median threads. Selenizone median, marked by narrow, elevated edges (elevation equivalent to that of cords); filled by somewhat regularly distributed lunules. Aperture slightly concave, outline elliptical, width ca.60% of length; edges undulating due to radial cords. Inner surface smooth, simple, glossy.
Measurements (in mm). Holotype: 2.5 by 0.8;
Simone, L. R. L.; Cunha, C. M. (2014). Taxonomical study on the mollusks collected in Marion-Dufresne (MD55) and other expeditions to SE Brazil: the Fissurellidae (Mollusca, Vetigastropoda).
Author: Jan Delsing

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