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Taxon profile

species

Pyrunculus medius (Dall, 1927)

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Opistobranchia - opisthobranchs »  family Retusidae »  genus Pyrunculus

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Pyrunculus medius

Author: MNHN

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Description

Shell small, white, polished, smooth, involved, the apex deeply narrowly perforate; the whorl enlarging anteriorly; aperture as long as the shell, very narrow behind, broad in front, the margin thin, sharp, straight, in front evenly rounded into the slightly thickened straight pillar; the latter has a narrow chink behind it; the posterior commissure of the aperture is evenly rounded over. Height, 5; diameter at apex, 1.5; maximum diameter, 3 mm. U. S. Nat. Mus. Cat. No. 107923.
Off Fernandina.
There is no clearly defined plait on the three specimens collected, but possibly it may develop later from the slight thickening observable.
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 Pyrunculus medius (Dall, 1927)]
Data retrieved on: 22 November 2013

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