Profil taxonu
Obrázky
Autor: Warén, A.
Velikost
Diameter of holotype 1.74 mm.
Popis
Type material. Holotype SMNH 4346 and 1 para type , SMNH 4347, 4 paratypes in MNHN.
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.
Material examined. The types and ~ Tuscan Sea, 400 m depth, on sunken drift wood, 3 specimens, coll. CARROZZA.
Description. Shell small, transparent, fragile, Planorbis-like. Larval shell of 1.25 distinctly hypertrophic 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.
Dimensions. Diameter of holotype 1.74 mm. Radula. Not examined.
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.
Material examined. The types and ~ Tuscan Sea, 400 m depth, on sunken drift wood, 3 specimens, coll. CARROZZA.
Description. Shell small, transparent, fragile, Planorbis-like. Larval shell of 1.25 distinctly hypertrophic 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.
Dimensions. Diameter of holotype 1.74 mm. Radula. Not examined.
Warén, 1992. New and little known "Skeneimorph" gastropods from the Mediterranean Sea and the adjacent Atlantic Ocean.
Rozšíření
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.
Also: Tuscan Sea, 400 m depth, on sunken drift wood, 3 specimens.
Autor: Jan Delsing
Odkazy a literatura
Galli C.: WMSDB - Wolrdwide Mollusc Species Data Base July 10, 2013 [http://www.bagniliggia.it/WMSD/WMSDhome....] [jako Xylodiscula lens Warén, 1992]Datum citace: 23. listopad 2013
Repetto G., Orlando F. & Arduino G. (2005): Conchiglie del Mediterraneo, Amici del Museo "Federico Eusebio", Alba, Italy [jako Xylodiscula lens Warén, 1992]