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Taxon profile

species

Alvania elisae Margelli, 2001

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Littorinimorpha »  family Rissoidae »  genus Alvania

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Alvania elisae

Author: Jan Delsing

Alvania elisae

Author: Shellauction

Taxon in country check-lists*

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Description

This species main characteristic is the teleconch sculpture made by either protuberances or aligned and quite evident roundish pearls-like, shaping at the crossing between the axial ribs and the spiral striae. This sculpture is present at the shell base too. In his original work the author compares A. elisae with its similar ones A. lineata, A. settepassii and A. schwartziana, with which it has analogies as far as the sculpture of the protoconch is concerned, but he puts in evidence the teleconch differences since lineata has a thinner spiral sculpture not blending with the axial ribs which are in a lower number. Compared with settepassii it is more roundish in outline, it has a larger number of axial ribs and a "pearl-like" sculpture missing in settepassii. Moreover elisae is compared with schwartziana from which it differs since it has a larger number of axial ribs and a different spiral sculpture that in schwartziana is made by spiral lines non prominent, non overhanging the axial ribs and by a base with three spiral cords. From waxen white to dark brown in colour pattern, w ith a protoconch always dark red wine in colour. The animal has a transparent foot with margins bright yellow in colour as per its tentacles. The adult specimens average measures are around 3.5-4 mm.
Scaperrotta, M. ,Bartolini, S. & Bogi, C., 2009. Accrescimenti, Vol. 2. Stages of growth of marine molluscs of the Mediterranean Sea. (secondary description)

Distribution

It can be found all around Capraia Is. only (Tuscan Archipelago - Italy).
Scaperrotta, M. ,Bartolini, S. & Bogi, C., 2009. Accrescimenti, Vol. 2. Stages of growth of marine molluscs of the Mediterranean Sea. (secondary description)
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 Alvania elisae Margelli, 2001]
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 Alvania elisae Margelli, 2001]

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