-
Oncoceratidae are
characterized by
generally compressed, cyrtoconic, and
breviconic s**** with an
exogastric curvature such that the
ventral profile is convex...
-
others curved (cyrtoconic); some were long (longiconic),
others short (
breviconic). Some long-s****ed
forms like
Endoceras attained s****
lengths close...
-
Silurian characterized by short,
essentially straight s****
referred to as
breviconic,
typically with a
faintly exogastric shape produced by the
profile of...
-
central Europe. Grimsbyoceras,
named by
Foerste in 1926, has a depressed,
breviconic s****, with an
elliptical transverse aperture,
without a
hyponomic sinus...
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Conostichoceras is a
genus of exogastric,
breviconic oncocerids included in the
family Nothoceratidae,
known from the
Middle Devonian of
central Europe...
- Proendoceras, and is the
likely ancestor of the
mostly compressed and
breviconic pilocerids as well as of more
similar forms such as Mcqueenoceras. Flower...
-
Clarkoceras is a
genus of
breviconic ellesmerocerid cephalopods, one of only two
genera known to have
crossed from the Late Cambrian, Trempealeauan, into...
- Devonian.
Gonatocyrtoceras is
characterized by
strongly curved, depressed,
breviconic s****.
Curvature is exogastric,
meaning the lower, or ventral, side is...
- The
overall s****
shape is
typically orthoconic (straight, pointed) or
breviconic (stout). The body
chamber is oncomyarian,
meaning that it is
ringed by...
- ellesmerocerids.
Members of the
family have
slightly endogastric (inwardly curved)
breviconic s**** with
ventral siphuncles that have
connecting rings thickened as...
