-
goniatitid family Reticuloceratidae which are
characterized by
involute subdiscoidal s****
covered by
linear or
biconvex growth lines that may be crossed...
-
previously included in the Hungeritidae. The s**** of
Arctohungerites is
subdiscoidal, involute, with a
rounded venter, weak
sigmoidal folds on the body chamber...
-
British Columbia. The s**** of
Griesbachites is involute,
subglobose to
subdiscoidal, ribbed; with
sloping sides converging on an
arched venter. Like Juvavites...
- an
Upper Permian shouchangoceratin pseudohaloritid characterized by a
subdiscoidal s****,
about 2 cm in diameter,
marked by
growth lines, as with Neoaganides...
-
attains 0.6 mm, its
diameter 1.3 mm. The minute, cream-colored s**** has a
subdiscoidal shape. The
spire is
slightly elevated. The
umbilicus is wide. The s****...
- Helicinidae. (Original description) The s**** is
rather small and thin,
subdiscoidal, and
flattened beneath, with a pale
brown coloration. The
epidermis is...
- by
Charles Hedley) The
height of the s****
attains 7 mm. The solid,
subdiscoidal, cream-colored s**** is
convex above. It
contains 4½
rounded whorls that...
-
marine gastropod mollusk in the
family Skeneidae. The
height of the
subdiscoidal s****
attains 0.75 mm, its
diameter 1.3 mm This
species occurs in the...
- Paleozoic. The
Dimorphoceratoidea can be
described as
Goniatitina with
subdiscoidal to
lenticular s**** that have con****uous
closed umbilici and goniatitic...
-
Acanthoclymeniidae are
characterized by
their small slightly involute,
subdiscoidal,
widely umbilicate s**** that
reach only a few
centimeters in diameter...
