Conus loochooensis (Macneil, 1960)
Descrizione.
Shell of
medium size, inflated and somewhat rounded in outline, spire of medium hight.
Protoconch not preserved on type. Aperture moderately wide. Outer lip very
gently curved in central part and rounded at the ends. Anal sinus not impressed,
with the growth lines across the anal fasciole showing little or no curvature.
Siphonal fasciole weakly developed. Sculpture consisting of 6 to 7 weak incised
spirals at the base of the whorl, which is otherwise smooth; spire bearing 3
well defined and subequal spiral depressions of the sutural slope of the early
whorls, but these become less distinct with 1 predominating over the others on
the later whorls (1).
This specie does not
compare closely with any now libing in the western Pacific of Indo-Pacific
region. It has somewhat the shape of Conus obeus (Hwass in Bruguiere, 1792)
[synonym of Conus zeylanicus (Gmelin, 1791)], but that species has a
much more strongly developed siphonal fasciole(1).
Some specimens of Conus
tessulatus (Born, 1778) approximate this species in the characters of the
spire, but they are not as rounded and inflated(1).
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Conus loochooensis (1)
Plate 7 fig. 24 |
Conus loochooensis (1)
Plate 10 fig. 12
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USNM 562877 mm. 46,0
x 26,7 Upper
Pliocene Shinzato
tuff member, Okinawa.
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Conus tessulatus (Born, 1778) mm. 42,6
x 24,7 Seycelles [AZRC 739-03] |
Conus zeylanicus (Gmelin, 1791) mm. 48,7 x 24,5 India [AZRC 726-00] |
Bibliografia