Conus
trisculptus (Pilsbry &
Johnson, 1917)
Description (2):
The shell is biconic, the spire composed of slightly concave whorls, with a low
carina projecting above the suture. On the last 2 ˝ whorls this carina bears low nodes (about 20 on the last whorl),
but on the earlier whorls the keel is smooth. The upper slope of each whorl has
prominent, arcuate radial striae but no spirals. Below the shoulder the surface
is slightly convex, contracted a little above the base. The lower half has
about 13 spiral grooves, widely separated except close to the base; and except
on the anterior fourth there are spiral series of small pustules which are slightly
lengthened in the axial direction, and are arranged in vertical rows, but
somewhat irregular in places.
Length
34.5, diam. 16.5 mm.; length of aperture 27 mm.
Costa Rica, Pliocene. W. M. Gabb. Type
No. 2567, A. N. S. P.
This cone was with the lot of C. consobrinus
ultimus, from which it is at once separable by the smooth keel of the upper
whorls.
Il Conus trisculptus č molto
simile al Conus granozonatus del Miocene.
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Conus trisculptus (1)
ANSP 2567 Tav.
XIX fig. 6 mm. 34,5 x 16,5 Pliocene – Costa Rica |
mm. 23,6 x 11,7
PLIOCENE – Okeechobee
[AZFC N. 253-01] |
mm. 19,3 x 9,1 [AZFC
N. 253-02] |
Bibliografia Consultata
·
(2) -
Pilsbry, H. A., and Johnson, 1917. Oligocene Fossils from the Neighborhood of
Cartegena, Columbia, with Notes on Some Haitian Species. Proceedings of
the Academy of Natural Sciences of Philadelphia, 69.
·
(3)
- Guppy, R. J. L., 1866. On the Tertiary Mollusca of Jamaica. The
Quarterly Journal of the Geological Society of London, 22: 281 -294 .
·
(4)
- Amos
P. Brown and Henry A. Pilsbry (1911) “Fauna of the Gatun Formation, Isthmus of
Panama”
· (5) – Wendell “Miocene mollusks from Bowden, Jamaica”