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Taxon profile

species

Turritella cooperi Carpenter, 1864

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

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Turritella cooperi

Author: McLean J.H. & Gosliner T.M.

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Description

Material Examined. Although this species is not represented in the voucher collection from the Santa Maria Basin, it is a common species on sand bottoms in southern California. The LACM collections contains 117 lots from California as well as additional lots from Baja California.
Description. Shell small for genus, thin; spiral sculpture of 2 prominent carinations per whorl and fine spiral striae; basal carination projecting and similar in strength to principal carinations; suture laid below basal angulation, base smooth except for fine spiral striae. Early whorls with lowermost carination developing first. Tan with brown axial markings. Height 35-55 mm.

Type Locality and Type Specimens. Santa Barbara, California, middle Pleistocene. According to Palmer (1958), the type material of Turritella cooperi has not been located. Turritella jewetti: middle Pleistocene, Santa Barbara; type material not located by Palmer (1958:169). Turritella orthosymmetra: Catalina Island, 50 fathoms; holotype: SBMNH 34534.
Distribution. Point Pinos, Monterey County, California (37°N), to southern Baja California south of Bahfa Magdalena (24°N), and the western side of the Gulf of California north to San Felipe. Its presence in the Gulf of California has not previously been reported.
Habitat. Living populations have not been studied. Common (except in Gulf of California) on sand bottoms at 25-100 m.

Remarks. The two strong carinae may project or be nearly flush with the profile of the shell (as in the synonym T. orthosymmetra). Merriam (1941) recognized three "varieties" of Pliocene age. Turritella jewetti is a probable synonym; it was discussed by Woodring (1946:69) and Valentine (1962).
Turritella cooperi is similar in size and occurrence to the North Atlantic species T. communis Risso, 1826, which has been extensively studied.
McLean J.H. & Gosliner T.M. (1996) Taxonomic atlas of the benthic fauna of the Santa Maria Basin and Western Santa Barbara Channel. Vol. 9, Pt. 2: The Mollusca: The Gastropoda.
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 cooperi Carpenter, 1864]
Data retrieved on: 23 November 2013

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