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Conus
stibarus |
(Woodring,
1928) |
Descrizione :
Shell moderately small, slender, spire high, shoulder angular. Outer lip strongly retractive, anal notch deep. Anal fasciole concave, bearing strong growth threads and, on the early whorls, obscure spiral threads. Shoulder tuberculate, but the tubercles gradually become broader and lower on body whorl. Body whorl sculptured with strong, wide spiral cords, separated by narrower interspaces bearing fine growth threads (1).
Length 31.4 mm.; diameter
11.9 mm. (holotype).
However unreasonable it may
seem to have two similar species of slender cones at one locality, this
species, represented by four specimens in the Henderson collection, is quite
different from gracilissimus, as the outer lip is more strongly
retractive. The flattening and broadening of the tubercles and the absence of
spiral threads on the anal fasciole of the later whorls also are characteristic
features. The spiral sculpture, except at the base, consists of rounded cords
instead of flattened bands, as in gracilissimus (1).
C. pernodosus Pilsbry and
Johnson (see Pilsbry, Proc. Acad. Nat. Sci. Philadelphia, vol. 73, p. 332, pi.
21, fig. 7, 1922, Miocene, Dominican Republic) has tubercles that flatten out
on the body whorl, but the outer lip is not so strongly retractive and the
spiral bands are flatter. The type of stibarus is another of the six
specimens in Guppy’s collection labeled “types” of gracilissimus (1).
Type material. —Holotype (U. S. Nat. Mus. No. 369612).
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Conus stibarus (1)
Plate
12 fig. 5 Holotype
USNM MO 369612 |
Conus stibarus
Holotype
USNM MO 369612 mm. 31,4 x 11,9 |
Bibliografia