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Taxon profile

species

Peristichia toreta W. H. Dall, 1889

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Allogastropoda »  family Pyramidellidae »  genus Peristichia

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Peristichia toreta

Author: Dall, W.H.

Peristichia toreta

Author: Femorale

Peristichia toreta

Author: Tunnell et al.

Taxon in country check-lists*

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Description

Shell slender, yellowish white, thirteen-whorled; nucleus minute, glassy, set on edge, having about two turbinate whorls; spire with the suture distinct, marked by a plain or slightly undulate thread behind it; behind this is a strong nodulated spiral, with round nodules, then a little interval and two more, slightly smaller, similar nodulous spirals, adjacent to each other and to the suture behind them; the last whorl would show about thirty-four nodules in its circuit; transverse sculpture of elevated ridges, visible in the interspaces following the line of the nodules across the whorl; on the rounded base they appear as strong radii; base with one strong cord, with a deep sulcus outside of it, and the space between it and the pillar somewhat excavated; aperture ovate; pillar straight, forming almost a right-angle with the lip in front of it; outer lip with three strong internal line; body with the basal cord projecting, slightly covered with enamel; outer lip swollen, varicose, and whiter than the rest of the shell, its margin undulated by the external sculpture; callus joining the pillar and outer lips distinct and continuous. Maximum longitude of shell, 10.75; of last whorl, 3; maximum latitude of shell, 3mm.
Dall, W.H. 1990. Scientific results of explorations by the U. S. Fish Commission Steamer “Albatross”. No. VII. Preliminary report on the collection of Mollusca and Brachiopoda obtained in 1887–88.

Interchangeable taxa

This is an extremely elegant shell, in which the relative strength of the, transverse and the spiral sculpture varies somewhat in different individuals. The sides of the spire are straight, but the whorls are distinctly marked.
Dall, W.H. 1990. Scientific results of explorations by the U. S. Fish Commission Steamer “Albatross”. No. VII. Preliminary report on the collection of Mollusca and Brachiopoda obtained in 1887–88.
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 Peristichia toreta Dall, 1889]
Data retrieved on: 23 November 2013

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