Cerion cisnerosi Clench and Aguayo, 1951

Original Description

"Cerion cisnerosi, new species

(Plate 11, figs. 3-4)

C. cisnerosi Torre, ms. (in sched.)

     Description. - Shell cylindric, somewhat extended, reaching 20 mm. (¾ of an inch) in length, rimately perforate  and strongly sculptured. Color light brown to grayish white and generally faintly mottled. Whorls 9 and very sligthly convex. Spire moderately extended, the early 6 whorls forming a mo­derately convex cone, the later 3 whorls nearly straight sided. The conic portion of the spire is produced at an angle of about 57°. Aperture subovate. Outer lip somewhat thickened, reflected and slightly turned backward. Parietal lip straight, well defined but not built forward appreciably. Columella short and arched. Parietal tooth centered, low and very short. Columellar tooth low and extending within for nearly a full whorl. Umbilicus rimately formed, short and shallow. Suture well defined but shallow. Sculpture: nuclear 1 ½ whorls smooth and glass-like, remaining whorls strongly costate with rather fine and nearly regular costae which number 25 to 32 on the body whorl.

Length	Width		Whorls
-----------	--------------		---------------
16.5	9	mm.	9	Holotype
20	9.2		9	Paratype
16.2	8.5		8.5	"
17.5	8		9	Cabo San Antonio
15	7		8	La Coloma

     Types. - Holotype, Museo Poey no. 12667. Paratype, Museo Poey and Museum of Comparative Zoölogy no. 187317, from Playa Morrillo, 11 kilometers west of Bahía Honda, Pinar del Rio, Cuba. Aguayo, Bermúdez, Clench, Jaume, Sánchez-Roig and Turner col­lectors.

     Additional records from Cabo San Antonio and near by local­ities and Cayo Real, La Coloma, all in Pinar del Rio, Cuba.

     Remarks. - This species has a wide distribution in western Cuba. It extends from Playa Morrillo, near Bahía Honda on the north coast west to Cabo San Antonio and east along the south coast as far as La Coloma. Specimens from these various localities do differ but their differences appear to be of a minor nature and fall well within the limits of variation often expressed in single colonies in various species in this genus.

     Named in honor of F. Cisneros, an early cuban collector who obtained the first known specimens of this species near Cabo de San Antonio.

     Cerion cisnerosi is a member of the C. cyclostomum Küster group (group IV as delimited by Pilsbry. Manual of Conchology, 1902 (2) 14, p. 196). It appears to be nearest in relationship to C. pineria Dall (Pl. V, fig. 5) from the Isle of Pinas. The main center for the group is in Oriente Province, though representatives are known from most of the northern Cuban coast.

     Differs from C. cyclostomum (= C. pineria Dall. ?) from the Isle of Pines, by its stronger and more separated ribs (32-38 in the last whorl in C. cisnerosi; 50-60 in C. cycostomum).

     Additional Paratypes from Ensenada de Cajón (Pl. 11, fig. 4) have the following dimensions:

Long                                                 Width

19.5                                                  9.5

18.5                                                  9.3

17.5                                                  8.5

Paratypes from Cape San Antonio:

Long                                                 Width

17.5                                                  8.5

18.0                                                  8.0

 

Paratypes from South coast of Cape San Antonio:

Long                                                 Width

15.5                                                  8.0

14.0                                                  7.5" (Clench & Aguayo, 1951:72-73)

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