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Taxon profile

species

Xylodiscula boucheti Warén, Carrozza & Rocchini in Warén, 1992

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

Size

Diameter of holotype 1.72 mm.

Description

Shell small, transparent, fragile, Planorbis-like. Larval shell of 1.3 distinctly hyperstrophic whorls, initial part weakly sculptured with irregular, sharp, very short, randomly dispersed ridges. Teleoconch of 2.3 whorls, sculptured only with weak incremental lines. Whorls just barely touching; suture consequently deep and channeled. Crosssection of whorls rounded, adapical side slightly flattened and sloping outwards from centre. Whorls coiled with upper surface at approximately same level and with an overlap over preceding whorl, measured on underside, corresponding to 1/5 - 1/6 of width of earlier whorl. Width of umbilicus about 40% of total diameter.
Soft parts. Foot very short and broad, posteriorly blunt, anteriorly shallowly bifid, with anterior corners drawn out to a width 60 % wider than foot, depth of indentation about 1/4 of width when crawling. Tentacles long and slender with very small eyes situated in centre of the bases. Snout short and conical. Two pallial tentacles situated close together at right corner of pallial cavity, anterior one three times longer than posterior one. Two white, pigmented mantle organs situated centrally in pallial skin, anterior one larger. Periostracum thin, slightly lamellose, brownish.
Source: Warén,A. 1992.

Distribution

Corsica, outer part of Baie de Calvi, 90-120 m. Also central part of the Tuscan Archipelago, in an amphora from 300-400 m depth.
Author: Jan Delsing

Links and literature

IT Repetto G., Orlando F. & Arduino G. (2005): Conchiglie del Mediterraneo, Amici del Museo "Federico Eusebio", Alba, Italy [as Xylodiscula boucheti Warén, Carrozza & Rocchini in Warén, 1992]

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