-
Oncoceratidae are
characterized by
generally compressed, cyrtoconic, and
breviconic s**** with an
exogastric curvature such that the
ventral profile is convex...
-
Silurian characterized by short,
essentially straight s****
referred to as
breviconic,
typically with a
faintly exogastric shape produced by the
profile of...
-
others curved (cyrtoconic); some were long (longiconic),
others short (
breviconic). Some long-s****ed
forms like
Endoceras attained s****
lengths close...
- ellesmerocerids.
Members of the
family have
slightly endogastric (inwardly curved)
breviconic s**** with
ventral siphuncles that have
connecting rings thickened as...
-
central Europe. Grimsbyoceras,
named by
Foerste in 1926, has a depressed,
breviconic s****, with an
elliptical transverse aperture,
without a
hyponomic sinus...
- of
orthocerids from the
Silurian of
North America. S**** are short,
breviconic, and
faintly curved.
Sutures are
fairly wide
spaced and
though straight...
-
narrow mid-dorsal
projection or salient. The s****, as for the family, is
breviconic, i.e. short,
curved toward the apex,
straight toward the aperture. The...
-
Clarkoceras is a
genus of
breviconic ellesmerocerid cephalopods, one of only two
genera known to have
crossed from the Late Cambrian, Trempealeauan, into...
-
deciduous early growth stages which undergo period truncation and an
inflated breviconic mature ascoceroid stage. The
Ascoceratidae are
divided into two, unequal...
-
order Oncocerida in
which s**** are
exogastrically or
endogastrically breviconic, planospiral, or torticonic;
often with a
constricted or
visored aperture;...
