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subspecies

Gibbula cicer thalia P. Bartsch, 1915

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Trochida »  family Trochidae - top-shells »  genus Gibbula »  species Gibbula cicer

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Gibbula cicer thalia

Author: Jan Delsing

Gibbula cicer thalia

Author: Bartsch, P.

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Description

Shell small, white, flaked with large patches of brown, sprinkled irregularly with blotches of carmine. Nuclear whorls two and one-half, well rounded, smooth. Postnuclear whorls strongly rounded, marked with five strong, equal, spiral keels between the sutures, of which the first is at the summit, while the last forms the peripheral keel. The spaces between the spiral keels are a little wider than the keels. In addition to the spiral sculpture the whorls are marked by very numerous, decidedly retractive, axial threads. Sutures strongly impressed. Base moderately long, well rounded, strongly, openly umbilicated, marked by nine, equal and equally spaced, depressed spiral cords, which are almost double the width of the spaces that separate them. In addition to these spiral cords the base is marked by the continuations of the axial threads. Inside of umbilicus smooth. Aperture subcircular, oblique; outer lip rendered decidedly sinuous at the edge by the external sculpture; inner lip strongly curved and slightly reflected.
The type, Cat. No. 187112, U.S.N.M., comes from Port Alfred (Coll. No. 658). It has three postnuclear whorls, and measures: Altitude, 4.5 mm.; greater diameter, 5.5 mm.
Bartsch, P., 1915. Report on the Turton Collection of South African marine mollusks, with additional notes on other South African shells contained in 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 Gibbula cicer thalia Bartsch, 1915]
Data retrieved on: 22 November 2013

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