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Taxon profile

species

Antiguraleus mundus H. Suter, 1909

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Neogastropoda »  family Mangeliidae »  genus Antiguraleus

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Antiguraleus mundus

Author: Jan Delsing

Description

Shell small, elongate-fusiform, thin and fragile, white, turreted, axially costate and spirally striated. Sculpture consisting of narrowly rounded, slightly oblique axial riblets, about 16 on the last whorl, nearly continuous over the whorls, obsolete on the base, the interstices slightly broader than the riblets ; they are crossed by spiral threads, 4 fine and close together on the shoulder, 1 on the carina of the whorl, and 3 below it, the uppermost of these at some distance from the keel ; the crossing-points produced into small oval gemmules ; the base is spirally striate, all the striae in front of the aperture being smooth. Colour white. Spire elevated conic, turriculate, nearly 1 ½ times the height of the aperture. Protoconch globular, of 1 ½ smooth whorls, the nucleus broadly rounded. Whorls 6, regularly increasing, with a high sloping shoulder, the keel on the spire-whorls near the middle, flat above and below the keel ; base contracted. Suture somewhat impressed, lightly margined below. Aperture pyriform, broadly angled above, with a short, broad, oblique, and truncated canal below. Outer lip convex, thickened by an axial rib, slightly angled above, and somewhat contracted below, with a shallow broad sinus at the suture. Columella slightly oblique, lightly excavated towards the straight parietal wall, curved below, and extending to the left margin of the canal. Inner lip thin, narrow, smooth.
Diameter, 3.2 mm. ; height, 7.5 mm.
Source: Suter 1913. Manual of the New Zealand Mollusca.

Interchangeable taxa

The species is closely related to the fossile Liracraea dictyota, Hutton, which, however, has less axial riblets ; the angle of the shoulder is above the middle of the spire-whorls ; and the protoconch is much smaller, with a minutely pointed nucleus.

Distribution

New Zealand
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 Antiguraleus mundus (Suter, 1909)]
Data retrieved on: 23 November 2013

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