Cerion (Umbonis) paucisculptum Clench and Aguayo, 1952

Original Description

"Cerion (Umbonis) paucisculptum, new species

Plate 54, fig. 1-2

Description.  Shell rimately perforate, strong, but rather light in structure, elongate, sculptured and reaching about 25 mm. (l inch) in length. Whorls 10 to 1O½, and only moderately con­vex. Color a dull gray to flat white. Spire conic and acutely convex, variable and produced at an angle of about 75°. Aper­ture subcircular. Parietal tooth small, centered and positioned well within the aperture. Columellar tooth small and also po­sitioned well within.the aperture. Outer lip reflected though not carried back as a collar. Parietal lip or ridge straight and well-developed in adult specimens. Suture but slightly in­dented. Sculpture consisting of numerous axial costae, variable as to height and number. There are 20 costae on the body whorl of the holotype. On certain specimens these costae are nearly obsolete on the last or body whorl. Spiral sculpture consisting of numerous fine and incised spiral grooves. Early 2½ whorls very finely and axially costate.

      length     width whorls

      24.8      11.5 mm.         10½                Holotype

      25           9.5                10½                 Paratype

      24           8.5                10½                      "

      23           9.0                10                         "

      22.3        9.0                10                         

 

Types. Holotype, Museum of Comparative Zoölogy, no. 192204, from Punta de Musica, Bahía de Samá, Banes, Oriente, Cuba, A. R. Quiñones, collector, 1947. Additional paratypes in the Museum of Comparative Zoology, the Museo Poey, no. 12905, the United States National Museum and the Museum of Zoology, University of Michigan and the collection of A. R. Quiñones.

Remarks. This species is related to both scalarinum and scalarinum sueyrasi. It differs from scalarinum in being far less conic and from both by having a material reduction in size and coarseness of the axial costae.

  It is known only from the type locality." (Clench & Aguayo, 1952: 425-427)

 

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