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species

Turbonilla guanacastensis 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 guanacastensis

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

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Description

Shell elongate-conic, slender, 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 only slightly immersed; normal whorls 10, moderately rounded, the first 3 increasing very little in size, later ones more rapidly; axial ribs low, rounded, nearly straight, moderately retractive, 18 appearing on the first whorl, increasing to 24 on the last whorl; interspaces a little wider than the ribs, crossed by a basal spiral series of deep pits and 10 unequal and unequally spaced shallower pits or incised lines; periphery rounded, marked by a narrow smooth band, base produced, aperture broken. The type measures: length, 4.3 mm.; diameter, 0.9 mm. A smaller paratype shows the aperture to be ovate and the base marked with 6 incised spiral lines of which the first 2 are interrupted by the feeble extensions of the axial ribs.
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 (Pyrgiscus) bartonella Strong & Hertlein in that the axial ribs are protractive rather than nearly vertical.
The specific name of this species is derived from the name of the state of Guanacaste, Costa Rica.
Hertlein, L.G. & Strong, A.M., 1951; Mollusks from the W. Coast of Mexico & Central America. Part 10

Distribution

Pacific Middle America
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 guanacastensis Hertlein & Strong, 1951]
Data retrieved on: 23 November 2013

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