- Archiacoceratidae, a
family characterized by compressed, exogastric,
cyrtocones with a large, actinosiphonate,
dorsal siphuncle. The
Paleobiology Database...
-
generally characteristic of its family, the Paraphragmitidae, an
annulated cyrtocone. In the case of
Calocyrtoceras striated both
transversely and longitudinally...
- conch, of
Cyrtocycloceras is a
moderately expanding annulated exogastric cyrtocone, with
curvature like that of a
rocking chair rocker. Annulations, encircling...
-
found in mid
Silurian sediments in Europe. The s**** is a
longiconic cyrtocone, like that of
Jovellania or Mixosiphonoceras,
except for
being compressed...
-
nautiloid cephalopods from the
Ordovician comprising exogastric longiconic cyrtocones, that is no
longer in
common use. The
Order B****lerocerida was established...
- the Poterioceratidae, a
family of
subcircular to
compressed exogastric cyrtocones without a
hyponomic sinus.
Mecynoceras has a compressed,
gibbous cyrtoconic...
-
Middle Ordovician of
Nevada (USA), the s**** a
small slender exogastric cyrtocone with the
venter more
narrowly rounded than the dorsum,
resembling in overall...
- of Australia. The s**** of
Macrodomoceras is a compressed,
endogastric cyrtocone, i.e.
section higher than wide and
curved with the
ventral side concave...
-
characterized by
depressed (or
rarely compressed)
exogastric brevicones and
cyrtocones (Sweet, 1964 K398) that
range from the
Middle Silurian to the
Middle Devonian...
- type
genus for the Karoceratidae. The s**** is a compressed,
exogastric cyrtocone,
section sub ovoid. The
siphuncle is ventral, near the outer, externally...
