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Taxon profile

species

Stereophaedusa cymatodes (Pilsbry, 1905)

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Pulmonata - pulmonates »  family Clausiliidae - door snails »  genus Stereophaedusa

Scientific synonyms

Megalophaedusa cymatodes (Pilsbry, 1905)

Images

Stereophaedusa cymatodes

Author: Pilsbry

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Description

Shell rimate, strong, the last two whorls of about equal diameter, occupying over half the length of the shell, those above rapidly tapering, somewhat attenuate toward the apex. Yellowish-brown.
Surface glossy, sculptured with coarse strong somewhat irregular ribs, rapidly decreasing to striae on the spire, the early whorls smooth from wear. Whorls convex, the last flattened laterally. The aperture is rhombic-ovate, vertical. Peristome continuous, rather broadly reflexed and thickened within. Superior lamella marginal, rather high, continuous with the spiral lamella, which penetrates to a point above the superior lamella. Inferior lamella low and receding, thick below, obliquely ascending, as long inside as the spiral lamella. Subcolumellar lamella emerging. Principal plicae dorsal and lateral, extending past the palatal plicae, of which there are three, lateral in position.
Length 22, diam. 5 mm.
Length 21, diam. 4.7 mm.
Clausilium narrow and parallel-sided, obtuse and obliquely rounded at the apex, bluntly angular in the middle of the palatal margin, not excised near the filament.
This ribstriate little Megalophaedusa is related to C. hiraseana. It differs in being much smaller, light colored, not quite so coarsely sculptured, with emerging subcolumellar lamella. C. nagashimana of the neighboring province Satsuma is more closely related, but that is also a large dark form. Both of these species differ widely from C cymatodes in the shape of the clausilium, which in cymatodes is very obtuse at the distal end. The number of palatal plicae will probably prove to be variable.
Tajiromura, Osumi. Types No. 87,610, A. N. S. P., from No. 1,249 of Mr. Hirase's collection.
Pilsbry, H. A., 1905. New Clausiliidae of the Japanese Empire. X.
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 Megalophaedusa cymatodes (Pilsbry, 1905)]
Data retrieved on: 23 November 2013

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