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Taxon profile

species

Turritella yucatecana Dall, 1881

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

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Turritella yucatecana

Author: Dall, W.H.

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Description

Shell small, thin, acute, opaque white mottled with rusty brown, of about twelve whorls ; nucleus and second turn minute, white, smooth, with deep suture, rounded and vermicular; next whorls with spiral sculpture, whereof three riblets about equidistant are markedly larger and more prominent than the rest; sculpture of mature whorls consisting of line spiral threads with nearly equal interspaces crossed by tine lines of growth and divided into five bands by four larger polished spirals, which are white and marked by rather distant dots of brown; of these bands of line spirals that behind the anterior suture and the two immediately behind it are of about equal width and equal to the two posterior hands and their included large spiral taken together ; the general surface, barring the large spirals, is marked by light nebulous transverse pencillings of brown, which in general accord in direction with the lines of growth ; the whorls are hardly at all rounded laterally, are slightly carinated by the three major spirals, and the last whorl is flattened on the base, but without any marked carina at the periphery of the base ; spiral sculpture of the base similar to that of the spaces between the major spirals on the side of the whorls, with here and there a slightly larger thread ; the transverse sculpture consists of the lines of growth above mentioned, which are most distinct on and between the minor spirals and irregular narrow undulations following the lines of growth (about twenty-five to the last whorl), which cross the larger whorls in some specimens so prominently as to render the major spirals almost tuberculate at their intersection, in most specimens produce a series of moderate undulations, and in others are almost obsolete ; outer lip thin, sharp, very little rounded, and hardly emarginated by the slight flexuosity of the lines of growth ; pillar rather thin, prettily arched, passing into the flattened basal edge; body polished, not callous; suture rather indistinct, not channelled ; base in several specimens dotted with convex, ovate, coriaceous, light yellow ovicapsules, whose surface, wrinkled in drying, seemed to have originally been smooth, and to have had a length of 0.75 and a breadth of 0.5 mm. Lon. of shell, 10.5 ; of last whorl, 5.5 ; of aperture, 3.25. Max. hit. of base, 5.0 ; of aperture, 2.75 mm. Yucatan Strait, 640 fms.
Dall, W.H., 1881. Reports on the results of dredging under the supervision of Alexander Agassiz, in the Gulf of Mexico and in the Caribbean Sea, 1877–79. Preliminary report on the Mollusca.
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 yucatecana Dall, 1881]
Data retrieved on: 2 May 2017

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