Conus
tricoratus (Hoerle, 1976)
Diagnosis (1):
Shell small, anteriorly attenuated, consisting of
three slender nuclear whorls and seven teleoconch whorls. Spire high, outline
concave; first four post-nuclear whorls elevated, axially costate in front of
carinate shoulders; narrow smooth band in front of adpressed sutures; summits
of whorls flat, microscopically striate; growth lines feeble and shallow;
labrum moderately prosocyrt. Obsolete, widely-spaced spiral cords on adapical
two-thirds of final whorl, ten rounded cords, crowded anteriorly, on abapical
one-third.
Dimensions of holotype: height 13.3 mm, diameter 6. 7 mm.
Holotype: USNM 220120.
Type locality: TU 951, Ten Mile Creek, about 1 ~ miles
west of Chipola River (SE Y4
Sec. 12, T1N, R10W), Calhoun County, Florida.
Occurrence: Chipola Formation, Florida ; late
lower Miocene.
Figured specimen: USNM 220120 (holoty pe) .
Other occurrences: TU locality nos. 457,458, 546 , 655, 817a,
830,998,1097.
Discussion:
C. tricoratus is the smallest of the Chipola cones, seldom reaching 15.0 mm in height.
It could be easily confused with the young of C. sulculus,
as the outline is similar. However, the resemblance is
only coincidental as this new species has a three whorled nucleus and axial
ribbing on the early teleoconch whorls. A seven whorled young C. sulculus will be about twice the height of
an adult (seven whorls) C. tricoratus.
About 100 individuals
of this species have been collected and, with the exception of three specimens,
all were taken from Ten Mile Creek localities
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Conus tricoratus
USNM 220120 (holotype) height
13.3 mm, diameter 6.7 mm. Locality: TU 951, Ten
Mile Creek |
Conus tricoratus
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Bibliografia
Consultata
·
(1) - Hoerle, S. E.,
1976. The
Genus Conus (Mollusca: Gastropoda) from the Alum Bluff Group of
Northwestern Florida. Tulane Studies in Geology and Paleontology, 12 (1 )