- the Poterioceratidae, a
family of
subcircular to
compressed exogastric cyrtocones without a
hyponomic sinus.
Mecynoceras has a compressed,
gibbous cyrtoconic...
-
found in mid
Silurian sediments in Europe. The s**** is a
longiconic cyrtocone, like that of
Jovellania or Mixosiphonoceras,
except for
being compressed...
- of the
order Oncocerida,
Fayettoceras has a s****
which is a
depressed cyrtocone with a
ventral cyrtochoanitic siphuncle of
elongated ovoid segments strongly...
-
include gyrocones, serpenticones, torticones, and
elongate orthocones and
cyrtocones,
reflective of the
different families and
genera (Flower, 1950; Sweet...
-
Middle Silurian of
Illinois consisting of
rapidly enlarging,
depressed cyrtocones with a
trapezoidal section;
ventral side
wider and
flatter than dorsal;...
-
Upper Ordovician belonging to the Oncocerida,
characterized by
exogastric cyrtocones that
expand slightly or
moderately and have thin walled, orthochoanitic...
- type
genus for the Karoceratidae. The s**** is a compressed,
exogastric cyrtocone,
section sub ovoid. The
siphuncle is ventral, near the outer, externally...
-
characterized by
depressed (or
rarely compressed)
exogastric brevicones and
cyrtocones (Sweet, 1964 K398) that
range from the
Middle Silurian to the
Middle Devonian...
-
characterized by depressed, or
rarely compressed,
exogastric brevicones and
cyrtocones. The
Paleobiology Database Akt****cheilus
entry accessed 8/21/12 Sepkoski...
- in Nova
Scotia and Quebec. S**** are depressed,
irregularly annulated cyrtocones with V-shaped
hyponomic sinuses,
ornamented by
longitudinal and transverse...
