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Taxon profile

species

Sorgenfreispira exilis (Ardovini, 2004)

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Neogastropoda »  family Mangeliidae »  genus Sorgenfreispira

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Sorgenfreispira exilis

Author: Mariottini et al.

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Description

Shell very small for the genus, height 3.4-3.6 mm, width 1.3-1.5 mm, biconical, turriculate elongate, solid. Protoconch multispiral, dome shaped, of 2.8-2.9 convex whorls. Proto-conch-I (embryonic shell) of 0.7-0.8 whorls, sep¬arated by a demarcation from protoconch-II (larval shell). First 1.6-1.7 apical whorls apparently smooth, covered with microgranules, the remaining with reticulated sculpture of 4 granulose spirals (3 major, 1 smaller subsutural), crossed by oblique axial riblets. Maximum diameter of protoconch 710-720 µm. Protoconch-teleoconch transition not well marked. Teleoconch of 2.5-3 whorls, rounded, sutural ramp convex, whorl sides gently convex. Last whorl about 3/5 of shell length. Axial sculpture of 10-11 prominent, flexuous and narrowly rounded axial ribs, regularly spaced, with broader interspaces. Spiral sculpture of 2 major granulose cords, with 25-36 irregularly alternating smaller granulose cordlets and interspaces of variable size. Each cordlet actually consisting of a rows of densely packed rounded granules. Aperture narrow, ovate, about 2/5 of the shell height. Siphonal canal moderately long, broad and open, deviating on the left. Inner lip with a moderately developed parietal callus. Outer lip not varicose. Anal sinus marked, arcuate on shoulder slope. Colour yellowish-brownish with two dark brown bands, one subsutural and the second on the middle of the last whorl; parietal callus brownish with siphonal canal white.
Mariottini P., Di Giulio A., Smriglio C. & Oliverio M. (2015). Additional notes on the systematics and new records of East Atlantic species of the genus Sorgenfreispira Moroni, 1979 (Gastropoda Mangeliidae).

Distribution

Western Sahara, Mauritania, Senegal, Ivory Coast, Angola
Mariottini P., Di Giulio A., Smriglio C. & Oliverio M. (2015). Additional notes on the systematics and new records of East Atlantic species of the genus Sorgenfreispira Moroni, 1979 (Gastropoda Mangeliidae).
Author: Jan Delsing

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