Conus
spenceri (Ward, 1992)
Diagnosis.— Shell small, thin, slender, biconical, with a long, narrow aperture and spiral striae on the lower half of the body whorl.
Description.— Shell small,
thin, slender, strongly biconical. Spire elevated, somewhat turbinate, with a sharply
angular shoulder demarking a slightly concave sutural ramp. Suture only
slightly impressed. Sculpture consists of 14 very small spiral folds on the
lower half of the body whorl. A small parietal ridge is apparent just below the
suture within the aperture. Aperture (broken in the holotype) is elongate, slender,
siphonstomatous. The holotype (USNM 405344) is 35.9 mm in height and 16.1 mm in
width.
Discussion.— Conus
spenceri is smaller and higher spired form than that from the St. Marys
Formation, C. deluvianus Green, 1830, it is much thinner-shelled and
narrower, and its spiral threads are more distinct. The spire on C.
deluvianus is almost smoothly conical, whereas on C. spenceri it is
somewhat turbinate. Conus spenceri differs from C. marylandicus
Green, 1830 from the Yorktown Formation of Virginia in being more slender and
higher spired.
Type information.— Holotype: USNM 405344. Type locality: Just below the
mouth of Whiting Creek, right bank of the Rappahannock River, Middlesex County,
Va. (USGS locality 26061).
Figured specimen.— Holotype (USNM 405344).
Stratigraphic and geographic range.— Eastover Formation, Cobham Bay
Member (upper Miocene) in Virginia.
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Conus spenceri
Pl.4 fig. 6 Eastover Formation (Miocene) of Richmond County Virginia Urbanna
Creek, above Urbanna, Essex Co., Va. height
35.9 mm. |
Bibliografia Consultata