- the Poterioceratidae, a
family of
subcircular to
compressed exogastric cyrtocones without a
hyponomic sinus.
Mecynoceras has a compressed,
gibbous cyrtoconic...
- conch, of
Cyrtocycloceras is a
moderately expanding annulated exogastric cyrtocone, with
curvature like that of a
rocking chair rocker. Annulations, encircling...
-
nautiloid cephalopods from the
Ordovician comprising exogastric longiconic cyrtocones, that is no
longer in
common use. The
Order B****lerocerida was established...
-
generally characteristic of its family, the Paraphragmitidae, an
annulated cyrtocone. In the case of
Calocyrtoceras striated both
transversely and longitudinally...
-
characterized by
depressed (or
rarely compressed)
exogastric brevicones and
cyrtocones (Sweet, 1964 K398) that
range from the
Middle Silurian to the
Middle Devonian...
-
found in mid
Silurian sediments in Europe. The s**** is a
longiconic cyrtocone, like that of
Jovellania or Mixosiphonoceras,
except for
being compressed...
-
Upper Ordovician belonging to the Oncocerida,
characterized by
exogastric cyrtocones that
expand slightly or
moderately and have thin walled, orthochoanitic...
- Ordocian, Australia. Ectocycloceras.
Compressed exogastric annulated cyrtocones with
straight transevse sutures and a
small marginal siphuncle composed...
-
characterized by depressed, or
rarely compressed,
exogastric brevicones and
cyrtocones. The
Paleobiology Database Akt****cheilus
entry accessed 8/21/12 Sepkoski...
- of the
order Oncocerida,
Fayettoceras has a s****
which is a
depressed cyrtocone with a
ventral cyrtochoanitic siphuncle of
elongated ovoid segments strongly...
