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Taxon profile

species

Xylodiscula lens Warén, 1992

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Allogastropoda »  family Xylodisculidae

Size

Diameter of holotype 1.74 mm.

Description

Shell small, transparent, fragile, Planorbis-like. Larval shell of 1.25 distinctly hyperstrophic whorls, initial part weakly sculptured with irregular, sharp, very short, randomly dispersed ridges. Adult teleoconch of 2 - 3 whorls, sculptured only by weak incremental lines. Whorls connected only for a very short distance, more or less at the periphery of the preceding one. Suture consequently deep and channeled. Cross-section of whorls rounded triangular, adapical side slightly flattened and sloping outwards from centre, abapical side also flattened, periphery of whorls well below mid-height. Whorls coiled with upper surface at approximately same level or with earlier whorl lower. Last whorl overlaps preceding whorl, measured on underside, corresponding to 1/8 - 1/10 of width of earlier whorl. Periostracum thin, slightly lamellose, brownish.
Source: Warén,A. 1992.

Distribution

Type locality. Corsica, outer part of Baie de Calvi, 90-120 m, on a bottom largely consisting of old Posidonia fibres, 6 specimens and shells.
Also: Tuscan Sea, 400 m depth, on sunken drift wood, 3 specimens.
Author: Jan Delsing

Links and literature

EN Galli C.: WMSDB - Wolrdwide Mollusc Species Data Base July 10, 2013 [http://www.bagniliggia.it/WMSD/WMSDhome....] [as Xylodiscula lens Warén, 1992]
Data retrieved on: 23 November 2013
IT Repetto G., Orlando F. & Arduino G. (2005): Conchiglie del Mediterraneo, Amici del Museo "Federico Eusebio", Alba, Italy [as Xylodiscula lens Warén, 1992]

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