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Acteon traskii Stearns, 1897

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Obrázky

Acteon traskii

Autor: Oldroyd, I.S.

Taxon v check-listech zemí*

* Výčet zemí nemusí být kompletní

EN  

Velikost

Length of shell, 11 mm ; length of body whorl, 9 mm; breadth, 6 mm. (Stearns.)

Popis

Shell small, conical above, cylindrical, rather solid, opaque, somewhat glossy ; sculpture consisting of numerous, fine, spiral, impressed lines or grooves, which become wider toward the base of the body whorl, making the sculpture of the lower portion of the shell lirate; part of the lirae are slightly grooved and in some cases show a tendency to run in pairs ; the grooved lines are not quite regular in their relative distances, and some are deeper than others ; the surface is otherwise sculptured by sharp, close-set, incremental lines; these latter are subordinate to the spiral sculpture and are more conspicuous on the lower part of the body whorl. Color dull-cream white, often with two obscure, broad, pale rufous bands on the body whorl. Spire short, obtusely conical. Whorls six (probably apex in example somewhat eroded) ; suture distinct, narrowly channeled. Aperture about two-thirds the length of the shell (not quite 9 mm.), acutely angular above, rounded and effuse below, finely lirate and glossy within, with a thin glazing on the body whorl. Outer lip thin, simple. Columella short and flexuous, with a conspicuous fold, curving around the same and thickening the edge of the lip, which is moderately produced in the umbilical region.
Source: Oldroyd, I.S. The Marine Shells of the West Coast of North America. Volume II.1.

Rozšíření

San Diego, California, to Panama. Fossil Pleistocene ; described from a fossil.

Zajímavosti

TYPE in United States National Museum, No. 148241. Type locality, San Diego, California.

Odkazy a literatura

EN Galli C.: WMSDB - Wolrdwide Mollusc Species Data Base July 10, 2013 [http://www.bagniliggia.it/WMSD/WMSDhome....] [jako Acteon traskii Stearns, 1897]
Datum citace: 23. listopad 2013

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