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Taxon profile

species

Turritella willetti J. H. McLean, 1970

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  family Turritellidae - Turritellas »  genus Turritella

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Turritella willetti

Author: McLean

Taxon in country check-lists*

Pacific Ocean, North America: Mexico

* List of countries might not be complete

Description

Description of Holotype: Shell moderately large, tapering, whorls 21, with thin periostracal remnants, nuclear whorls lost; earliest whorls highly convex with deep sutures, under magnification the spiral sculpture on about the 6th whorl consisting of about 16 narrow, raised threads with slightly broader interspaces; at about the 9th whorl 5 of the threads become more prominent and the area below the 3rd thread from the base bevels in toward the suture, the cording above tending to become flat sided, rather than convex as in the early whorls. On the penultimate whorl 5 strong cords remain, the general effect is of flat sided whorls, beveling in above and below the suture. The base is rounded and there are faintly indicated spiral cords. Aperture nearly circular, lip thin; growth-line trace slanting backwards, forming a broad, shallow sinus close to the anterior suture. Color whitish with brown maculations, stronger cords with alternating light and dark markings. Height, 73.0 mm, diameter, 13.7 mm.
McLean J.H. -1970 - New species of Panamic gastropods.

Interchangeable taxa

Turritella willetti is a species familiar to collectors having dredged along the Mexican coast. SHASKY (1961) attempted to equate the species with REEVE'S Turritella sanguinea (REEVE, 1849, p. 6, fig. 27), which was said to be from "California." In REEVE'S illustration the final whorls are also convex and other details of sculpture and color pattern do not correspond. REEVE'S taxon is most likely not West American.
Turritella willetti, with its strongly convex early whorls, cannot be confused with other eastern Pacific species, all of which have fewer spiral cords on the early whorls. The cording of the mature whorls is variable and is similar to the pattern observed in T. mariana DALL, 1908. The largest specimen observed measures 81 mm in length.
McLean J.H. -1970 - New species of Panamic gastropods.

Distribution

Type Locality: Santiago Bay, Manzanillo, Colima. Mexico, 19°06'N, 104°23'W, 7-12 fathoms.
McLean J.H. -1970 - New species of Panamic gastropods.
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 Turritella willetti McLean, 1970]
Data retrieved on: 23 November 2013

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