- Archiacoceratidae, a
family characterized by compressed, exogastric,
cyrtocones with a large, actinosiphonate,
dorsal siphuncle. The
Paleobiology Database...
- in Nova
Scotia and Quebec. S**** are depressed,
irregularly annulated cyrtocones with V-shaped
hyponomic sinuses,
ornamented by
longitudinal and transverse...
-
nautiloid cephalopods from the
Ordovician comprising exogastric longiconic cyrtocones, that is no
longer in
common use. The
Order B****lerocerida was established...
-
characterized by depressed, or
rarely compressed,
exogastric brevicones and
cyrtocones. The
Paleobiology Database Akt****cheilus
entry accessed 8/21/12 Sepkoski...
-
Middle Silurian of
Illinois consisting of
rapidly enlarging,
depressed cyrtocones with a
trapezoidal section;
ventral side
wider and
flatter than dorsal;...
- the Poterioceratidae, a
family of
subcircular to
compressed exogastric cyrtocones without a
hyponomic sinus.
Mecynoceras has a compressed,
gibbous cyrtoconic...
-
Upper Ordovician belonging to the Oncocerida,
characterized by
exogastric cyrtocones that
expand slightly or
moderately and have thin walled, orthochoanitic...
- Reudemannoceras. Both are from the
early Middle Ordovician; both have
endogastric cyrtocones,
except in
Franklinoceras they are
compressed so as to be
higher than...
-
Glyptodendron is a
Lower Silurian westonocerid characterized by
compressed cyrtocones with a
narrowly rounded dorsum and
greatest width in the ventrolateral...
-
Reedsoceras was
named as a
genus characterized by
rapidly expanding exogastric cyrtocones with
unconstricted apertures and
straight sutures. The
siphuncle is close...
