Conus bocapanensis (Spieker, 1922)

 

 

Descrizione e caratteristiche:

 

Shell small to medium-sized, unequally biconic, the spire turreted. The spire is fairly high, including about a third of the entire height, its slopes straight in profile. Whorls 8-9 in number, the first two of the spire smooth and rounded, the following with a marked keel at the lower third, the surface above the keel being concave and below straight. On the spire the sculpture is of growth-lines, poorly defined, only. On the body whorl are sixteen or seventeen spiral bands, separated by narrow interspaces, with growth-lines in the interspaces. The spiral sculpture is weaker near the shoulder. The shoulder of the body whorl is sharp, the surface below being straight. Aperture fairly narrow, of constant width, the columella slightly reflexed at the base.

 

Height, 37; diameter, 17 mm.

 

This species is closely related to a group of small cones from the Antillean-Carribean region. It is perhaps closest to C. tortuosostriatus (Toula, 1911), from Gatun; it differs only in having simple instead of differentiated spiral sculpture, and in lacking the beaded keels characteristic of tortuosostriatus. It is also similar to Conus multiliratus var. gaza (Johnson and Pilsbry, 1911), from Gatun, Bowden, and Santo Domingo and Zorritos, but it is more slender, and has broad-topped ribs on the body whorl instead of the finer spirals of gaza.

C. imitator (Brown and Pilsbry, 1911), from Gatun, differs in having 16 ribs on the lower half of the body whorl instead of 16 over the entire surface, and in having the profile of the spire concave instead of straight. The spire of bocapanensis differs in similar way from that of C. planiliratus (Sowerby, 1870), from Santo Domingo; the profile is straight in lines instead of concave (1).

 

Lower Zorritos Fm. North of Quebrada de Boca Pan, Perù.



 

Upper Miocene: Panama, Perù, Ecuador

 

 


 

 

Conus bocapanensis

Plate 1 fig. 3

mm. 37 x 17

Perù

 

 

 

 


 

 

 

 

 

 

 

Conus bocapanensis

Plate 1 fig. 3

mm. 37 x 17

 

 

 

 

 



Bibliografia Consultata

 

·        (1) - Spieker, E. M., 1922. The Paleontology of the Zorritos Formation of the North Peruvian Oil Fields. Johns Hopkins University Studies in Geology, 3: 1 -196

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