Conus shimajiriensis
(Macneil, 1960)
Descrizione.
Shell moderately small,
medium inflated , spire of medium height. Protoconch missing on the type except
for a small fragment of the last whorl which is smooth and polished. Aperture
slightly narrower at anal end than at siphonal end. Sculpture on the body whorl
nearly smooth although a few very weak spiral ridges can be made out ; spire
sculptured by four incised spiral lines on the subsutural slope and poorly developed
nodes along the periphery (1).
Holotype ( USNM 562771 )
measures : height 21 mm, diameter 10 mm.
Type
locality : Yonabaru clay member 17451.
This species may be related
to C. tuberculatus Yokoyama ( = tuberculosus Tomlin ) from the
Koshiba formation ( Pliocene) of Japan , but both its spiral sculpture and
peripheral tubercules are weaker than on the Koshiba species (1).
Distribution : Miocene, (
Yonabaru clay member) Okinawa.
Localities : Yonabaru clay
member, 17451 ( figured type ) .
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Conus shimajiriensisHolotype ( USNM 562771 ) Pl. 6 figs. 5,11 mm. 21 x 10 |
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Bibliografia