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species

Turbonilla utuana J. G. Hertlein & A. M. Strong, 1951

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

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Turbonilla utuana

Author: Hertlein, L.G. & Strong, A.M.

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Description

Shell elongate-ovate, white; nucleus having a depressed helicoid spire with the axis at right angles to that of the following whorls, in the first of which it is about one-third immersed; normal whorls 7, upper whorls slopingly shouldered, flat-sided, later whorls Slightly shouldered, slightly rounded; axial ribs strong, straight, vertical. 14 appearing on the first whorl, increasing to 20 on the last whorl; interspaces about twice as wide as the ribs, crossed by 4 spiral series of rectangular pits, the spaces between which appear as flat-topped cords of unequal width, the lower 2 of these cords cut by 2 or 3 fine incised spiral lines; periphery rounded, marked by a narrow spiral cord; base rounded, with a spiral row of pits just below the peripheral cord formed by the enfeebled extensions of the axial ribs, below this there are 3 or 4 spiral cords and in the umbilical region several fine incised spiral lines; aperture ovate, outer lip thin, columella curved, slightly raised. The type measures: length, 3.1 mm.; diameter, 0.9 mm.
Hertlein, L.G. & Strong, A.M., 1951; Mollusks from the W. Coast of Mexico & Central America. Part 10

Interchangeable taxa

The shell of this species differs from that of Turbonilla (Pyrgisculus) eucosmia Dall & Bartsch in that the ribs are nearly vertical on all the whorls rather than strongly retractive on the last whorl.
Hertlein, L.G. & Strong, A.M., 1951; Mollusks from the W. Coast of Mexico & Central America. Part 10

Distribution

Near Port Parker, Costa Rica
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 Turbonilla utuana Hertlein & Strong, 1951]
Data retrieved on: 23 November 2013

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