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.
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Conus peruvianusPlate
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 |
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Conus peruvianusUpper Eocene |
Conus peruvianusUpper Eocene |
Bibliografia Consultata
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(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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