- its
width greater than its height.
Litoceras somewhat resembles the
tarphyceratid Pionoceras from the same time,
except for the siphuncle[clarification...
-
Tarphyceras is a
genus of
tarphyceratid with
whorls rounded in
cross section,
having a
deeply impressed dorsum and a
ventral to
subcentral siphuncle,...
- B****leroceras or
possibly from some
member of the Estonioceratidae.
Tarphyceratids vary in form and
siphuncle position. The
siphuncle may be subcentral...
-
exception of the
dorsal siphuncle,
Curtoceras is
somewhat similar to the
tarphyceratid Campbelloceras List of
nautiloids Furnish, W.M. and Glenister, Brian...
-
nautiloid cephalopods from the
Upper Ordovician of China, ****igned to the
tarphyceratid family Lituitidae. The type,
Xainzanoceras xaizangense Chen resembles...
-
Kummel 1950,
Sweet 1964). The
Barrandeoceratidae are
derived from the
tarphyceratid genus,
Centrotarphyceras through Barrandeoceras (Flower 1984), and is...
-
Trocholitidae are
derived from the Tarphyceratidae,
perhaps from
different tarphyceratids.
Members of the
Trocholitidae vary in
whorl section and
siphuncle position...
- the Plectoceratidae, Lechritrochoceratidae, and Apsidoceratidae. The
tarphyceratids comprise the
Tarphycerida of the
Treatise on
Invertebrate Paleontology...
-
Campbelloceras is a
tarphyceratid nautiloid known from the
Lower Ordovician,
Upper Canadian Epoch of
North America,
where it is widespread. Campbelloceras...
- Plectoceras, and
therefore the Plectoceratidae, is
derived from the
Tarphyceratid genus Campbelloceras while Barrandeoceras, and
therefore the Barrandeoceratidae...
