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nautiloid cephalopods from the
Upper Ordovician of China, ****igned to the
tarphyceratid family Lituitidae. The type,
Xainzanoceras xaizangense Chen resembles...
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Kummel 1950,
Sweet 1964). The
Barrandeoceratidae are
derived from the
tarphyceratid genus,
Centrotarphyceras through Barrandeoceras (Flower 1984), and is...
- its
width greater than its height.
Litoceras somewhat resembles the
tarphyceratid Pionoceras from the same time,
except for the siphuncle[clarification...
- Plectoceras, and
therefore the Plectoceratidae, is
derived from the
Tarphyceratid genus Campbelloceras while Barrandeoceras, and
therefore the Barrandeoceratidae...
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Campbelloceras is a
tarphyceratid nautiloid known from the
Lower Ordovician,
Upper Canadian Epoch of
North America,
where it is widespread. Campbelloceras...
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exception of the
dorsal siphuncle,
Curtoceras is
somewhat similar to the
tarphyceratid Campbelloceras List of
nautiloids Furnish, W.M. and Glenister, Brian...
-
comprise three phylogenetically related groups of families. They are: the
tarphyceratid group consisting of the Estonioceratidae, Tarphyceratidae, Trocholitidae...
- unknown,
although evolutionary possibilities can be
found in
various tarphyceratid and
trocholitid genera. The
tendency for the
adult tarphycerid s****...
- B****leroceras or
possibly from some
member of the Estonioceratidae.
Tarphyceratids vary in form and
siphuncle position. The
siphuncle may be subcentral...
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Tarphyceras is a
genus of
tarphyceratid with
whorls rounded in
cross section,
having a
deeply impressed dorsum and a
ventral to
subcentral siphuncle,...
