Conus peruvianus (Olsson, 1930)

 

 

Descrizione e caratteristiche:

 

Shell small with moderately high spire, straight sides and generally noded shoulder angle; whorls 8 or more, forming a mod
erately high, conic spire whose height is approximately ¼th the full length; sutures close, distinct, situated slightly below the 
edge of the spire-whorls; the upper surface of the spire-whorls is flat to slightly concave, sculptured simply by the strongly curved growth-lines; the shoulder of the last whorl is strongly angled smooth or noded; the spire-whorls are coarsely noded, just above the lower suture, there being on an average about 16 nodes to a volution of a later turn; upper 2/3rds of the surface of last whorl smooth, with 8 or 9 wide spiral bands on the anterior canal. 


Height 21 mm.; diameter 9.5 mm.; aperture 15 mm. 



Remarks. — The noding of the shoulder angle is a variable 
feature some shells remaining coarsely noded throughout life while in others the shoulder angle becomes sharp and smooth on the later turns. There are several small, noded Cones which distantly resemble peruvianus, Conus remondi Gabb from the Tejon Eocene of California, according to Stewart's 33 figure is a smaller species with more numerous (22) shoulder nodes. Conus parvus Lea from the Claiborne sands differs in having the upper surface of the spire-whorls finely spirally sculptured. In the Parisian Eocene, peruvianus finds its closest parallel with Conus parisiensis Desh. 


Locality and Geologic Occurrence. — Talara formation, Yasila. 

 

 


 

 

Conus peruvianus

Plate 5, Figg. 13,14,15

 

Holotype fig. 13: mm. 21,0 x 9,5

Fig.14: 19,5 mm.

 Fig. 15: 13,5 mm.

 

Upper Eocene

 

Conus peruvianus

Paratype 24223

Upper Eocene

 

Conus peruvianus

Paratype 24224

Upper Eocene

 

 

 

 



Bibliografia Consultata

 

·         (1) - Olsson, A. A., 1930. Contributions to the Tertiary Paleontology of Northern Peru: Part 3, The Eocene Mollusca. Bulletins of American Paleontology, 17 (62 )

 

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