Conus couvaensis
(Vokes, 1938)
Description.
Shell of medium size, spire low
almost flat, shoulder angulate to sub-truncate; nucleus decollete; post-nuclear
whorls eight, deeply excavated on top, with a strong spiral ridge at the
shoulder, otherwise lacking ornamentation; body whorl relatively short, broadly
convex in outline, ornamented anteriorly by broad flat ribs which appear as if
overlapping posteriorly; aperture broader anteriorly, outer lip moderately
retractive, anal notch deep, siphonal notch shallow, siphonal fasciole slightly
bulging.
The extremely low, almost flat spire, and the swollen convex outline of
the body whorl serve to distinguish this species. Conus veatchi
Olsson (1922, p. 216, P1. v, figs. 5, 8) from the Middle Miocene Gatun Stage of
Costa Rica has a somewhat similar shape. However, the body whorl is less
inflated and the shoulder of the whorl is ornamented with ten to eleven fine
spirals.
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Conus couvaensisHolotype, No. 24998 mm. 37,7 x 23,5 |
Conus
veatchi
Holotype 20894 (2)
mm. 43 x 28
Gatun Stage: Water Cay Costa Rica |
Bibliografia Consultata