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Taxon profile

species

Megalophaedusa hosayaka (Pilsbry, 1905)

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

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Megalophaedusa hosayaka

Author: Pilsbry

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Description

Shell slender, regularly tapering from the penultimate whorl, the upper third attenuate, apex obtuse; thin but moderately strong, light brown. Surface glossy, very finely striate. Whorls about 13,5, moderately convex, the last somewhat flattened on the back. Aperture small, oblique, squarish-piriform, the peristome reflexed, somewhat thickened within, continuous, the parietal margin shortly raised, and emarginate above the superior lamella. Superior lamella compressed, only slightly oblique, continuous with the spiral lamella, which penetrates to the middle of the ventral side. Inferior lamella receding, visible in the aperture as a small fold, straightly ascending within the back, penetrating a little further inward than the spiral lamella. Subcolumellar lamella either emerging to the lip-edge or immersed. Principal plica short, chiefly dorsal. Upper palatal plica short, oblique, not connected with the very weak lateral lunella, which is obsolete below, and curves inward above or connects with a short, weak second palatal plica. There is no lower palatal plica.
Length 22.5, diam. 4.5 mm.
Length 21.5, diam. 4.3 mm.
By its palatal armature this species belongs to the Hemiphaedusan group of C. sublunellata. It is readily distinguished from other known species of that group by the greater number of whorls and more slender spire. The lunella is very feebly developed, and probably will be found to be sometimes obsolete, as in some other species of the group.
Kamomura, Shima. Types No. 86,521, A. N. S. P., from No. 1,176 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 hosayaka (Pilsbry, 1905)]
Data retrieved on: 23 November 2013

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