Conus
tokunagai (Otuka, 1934)
Descrizione (1).
Shell
moderate in size, elongate conic; spire elevate, acute, slightly concave when
seen sideways. Whorls 9-8 shouldered; shoulder smooth, subrounded, above which the
surface is somewhat concave with oblique line of growth and fine spiral striae
which number about 6-8 on the penultimate whorl. On the body whorl the
oblique spiral cords only appearing near the lower end. Number of the oblique
spiral cords about 13-11 near the inner margin of the aperture. Number of cords
in 5 mm. length about 5-6. Aperture long and narrow.
Occurrence:—LOWER KADONOSAWA
SERIES (Early Miocene). Nisatai (loc. 3; rg. no.
1593).
This
species is very closely allied to
Conus pauperculus Sowerby, living in
the temperate waters of Japan, but the former differs from the latter in
that the shell has a highspite and prominent spiral cords with broad
interspaces.
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Conus tokunagai
Syntype CM 12124 pl. 50, figs. 83, 84 mm. |
Conus tokunagai
mm. |
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Conus tokunagai (3)
Pl.3 figg. 8a, 8b |
Conus tokunagai (2)
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Bibliografia
·
(1) - Otuka, Y.,
1934a: Tertiary structures of the northwestern end of the Kitakami
mountainland, Iwate Prefecture, Japan. Bulletin of the Earthquake Research
Institute, Tokyo Imperial University, vol. 12, pt. 3, pp. 566–638, pls. 44–51. (Reference No. 0384)
·
(2) - NIASUDA, Koichiro. (1967) “Molluscan
Fauna of the Higashi-Innai Formation of Noto Peninsula, Japan-III; Description
of New Species and Remarks on Some Species