Cerion (Umbonis) acuticostatum Sánchez Roig, 1948

Original Description

"Cerion scalarinum acuticostatum novo subsp.

(Lám. 1, fig. 5)

Este Cerion parece ser una raza geográfica del Cerion scalari­num, de la cual se distingue por la forma mas delgada de la concha y porque las costillas axiles son más afiladas. La localidad esta muy apartada de la forma típica que es Gibara.

Longitud . . . . . . . . . . . . . . . . ..  19.5 mm.

Diámetro mayor. . . . . . . . . . . . .  7"

Diámetro menor. . . . . . . . . . . . . .6"    

Longitud de la abertura. . . . . . . . 4"

Diámetro de la abertura. . . . . . . .3"

Localidad. - Costa norte de Cayo Mégano Grande. Norte de Camagüey.

Nota. - El tipo de esta especie se encuentra depositado en la colección del autor con el número 1,001 y un paratipo en el Museo Poey de la Universidad de La Habana." (Sánchez Roig, 1948:68)

ENGLISH TRANSLATION

Cerion scalarinum acuticostatum new subsp.

(Plate. 1, fig 5)

This Cerion appears to be a geographic race of the Cerion scalarinum, from which it is distinguished by its thinner shell form and sharper axial ribs. The locality is distant from the typical form that is Gibara.

Length. . . . . . . . . . . . . . . . .. 19.5 mm

Greater diameter. . . . . .   . . . 7"

Smaller diameter. . . . . . . . .  6"

Aperture length. . . . . . . ……4"

Aperture diameter . . . . . . . . .3"

Locality. - North Coast of Great Mégano Key. North of Camagüey.

Note. - the type of this species is deposited in the author's collection with the number 1,001, and a paratype, in the Poey Museum of the University of Havana.

 

Supplemental description from Clench & Aguayo, 1952

"Shell reaching about 23 mm. (about 1 inch) in length, rather light in structure, nearly imperforate and strongly sculptured. Color a dull gray. Whorls 11 slightly con­vex. Nuclear whorls glass-like and very faintly costate. Spire extended forming a cone which extends to the summit from the body whorl. It is produced at an angle of 18° to 20°. Aper­ture subcircular to subovate. Outer lip thin and reflected. Parietal ridge very weak and not elevated but rather flattened on the parietal wall. Parietal tooth centered and rather small and extending back for nearly a full whorl. Columellar tooth rather small and extending back for at least a full whorl. Col­umella short. Umbilicus rimately formed but exceedingly shallow. Suture moderately indented. Axial sculpture consist­ing of numerous and irregular costae which number 12 to 14 on the body whorl. Spiral sculpture consisting of numerous incised lines which cut into the shell. This is somewhat vari­able, certain specimens are lacking these incised lines. Surface powdered with a fine shell material which usually lines up along the incised lines. Agglutinated sand grains present on live shells." (Clench & Aguayo, 1952: 421-422)

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