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Taxon profile

species

Seguenzia certoma W. H. Dall, 1919

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Seguenziida »  family Seguenziidae »  genus Seguenzia

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Description

Shell small, trochiform, white, with a minute, smooth globular nucleus and seven subsequent strongly sculptured whorls; suture obscure: spiral sculpture of a small, closely beaded thread at the summit of the whorl, separated from a low, sharp carina by a wider, excavated interspace, and the latter from a more prominent periph¬eral carina by a still wider space: on the base are three sharp threads followed by three lower rounded threads, which approach the pillar; axial sculpture of line, even, arcuate wrinkles, which, except where they bead the posterior thread, are chiefly visible in the interspaces; the suture is laid on the peripheral thread and between it and the outer lip at the aperture is a very deep sulcus; the outer lip is much produced and its edge modified by the external sculpture, so that there is a sulcus at the end of the peripheral keel, another at the middle of the base, and still another at the base of the pillar, which is arcuate and produced like a small plait: the base is imperforate, the body with no visible glaze; height, 5: diameter, 3,5 mm. U.S. Nat.Mus. Cat. No. 211167.
Dall, W.H., 1919. Description of new species of Mollusca from the north Pacific Ocean in the collection of the United States National Museum.

Distribution

Type locality:U.S. Fish Commission station 4337, off Point Loma. California
Dall, W.H., 1919. Description of new species of Mollusca from the north Pacific Ocean in the collection of the United States National Museum.
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 Seguenzia certoma Dall, 1919]
Data retrieved on: 22 November 2013

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