Conus ruckmani (Dickerson, 1917)
Description.
Shell small with six
whorls; surface of each whorl between wavy, linear suture and shoulder, concave
and marked by three or four spiral threads cut by numerous, crescentric growth
lines; 18 to 24 rounded nodes decorating shoulder whorls; body whorl marked by
about 20 granular spiral ribs (1).
Length: 12,5 mm. Width: 7
mm.
Period: Oligocene
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Conus ruckmani (Dickerson, 1917) (1) Type 431 – Cal.Acad.Sci. Oligocene mm. 12,5
x 7 Vader,
Località 181 Washington |
Conus ruckmani (Dickerson, 1917) Oligocene mm.
12,5 x 7 |
Conus warreni (Hendon in Turner,
1938)
Shell unequally biconical, body whorl more then twice the length of the spire; seven whorls; shoulder angulate and ornamented by 20 subdued nodes; suture linear, space between suture and shoulder concave and marked with three of four spiral threads; body whorl ornamented with 17 flat spiral ribs separated by very narrow interspaces. Growth lines are visible on the exterior surface of the body whorl.
This species closely
resembles Conus ruckmani. It is
distinguished from this form by the character of the ribbing: Conus ruckmani
has narrow ribs and broad interspaces; Conus warreni has broad ribs and
narrow interspaces.
Conus goodmani lacks the
ribbing over the body of the whorl and is more slender.
The
work which is the foundation of this report was begun at the University of
Oregon in 1928. The nucleus was a manuscript on the Glide fauna prepared by
Bryan Hendon but never published owing to his untimely death while engaged in
geologic exploration in Venezuela. In recognition of his work the new species
which he recognized and described are credited to him in the present paper.
From the autumn of 1929 to July 1935, the problem was carried on at the
University of California. Conus warreni,
14, 36, 68, 69, 110
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Conus
(Leptoconus) amekiensis
(Eames, 1957) Holotype G.41837: Pl. 7, figs. 7 a-c mm. 19 x 10 Ameki
Formation – Middle to Upper Eocene – Nigeria |
Conus warreni
mm. 16,8 x 9,0 Middle Eocene – Oregon |
Conus ruckmani (Dickerson, 1917) (1) Type 431 – Cal.Acad.Sci. Oligocene mm.
12,5 x 7 Vader,
Località 181 Washington |
Bibliografia Consultata
- (1)
– Dickerson (1917) “Climate and its influence upon the Oligocene faunas of
the Pacific Coast, with description of some new species from the
molopophorus lincolnensis zone“
- (2) - Turner, F. E., 1938. Stratigraphy
and Mollusca of the Eocene of Western Oregon. Geological Society of
America Special Papers, 10