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Taxon profile

species

Astyris appressa Dall, 1927

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Neogastropoda »  family Columbellidae - Dove Shells »  genus Astyris

Scientific synonyms

Mitrella appressa W. H. Dall, 1927

Images

Astyris appressa

Author: USNM

Taxon in country check-lists*

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Description

Shell, small, short, stout, white, with an inflated blunt nucleus of a whorl and a half and about three subsequent whorls; suture dis¬tinct, not appressed; spiral sculpture of fine close equal even and evenly distributed threads covering the whole shell; axial sculpture of a few irregularly distributed obscure ridges most obvious on the spire, and very fine close well-marked incremental lines; aperture narrow, outer lip varicose with five or six denticles within, body with a thick coat of enamel, pillar short, canal very short, but recurved. Length of shell, 6; of aperture, 3; diameter, 3 mm. U. S. Nat. Mus. Cat. No. 108326. Off Georgia and Fernandina, nine specimens.
The prominent characteristic of the typical shell is the way the rotundity of the whorls is suppressed so as to indicate a smooth spindle shape for the whole shell.
A variety ? (333458) from the same station is more slender, and has the upper whorls nearly smooth and the threads on the last whorl coarser and the varix less prominent.
Dall, W.H., 1927. Small shells from dredgings off the southeast coast of the United States by the United States Fisheries Steamer 'Albatross' in 1885 and 1886.
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 Astyris appressa Dall, 1927]
Data retrieved on: 22 November 2013

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