- form and
siphuncle position. The
siphuncle may be
subcentral as in
Centrotarphyceras;
intermediary as in Tarphyceras, or
subventral as in Campbelloceras...
- Campbelloceras,
Barrandeoceras with its
subcentral siphuncle possibly from
Centrotarphyceras.
Rousseau H. Flower, 1984. Bodeiceras; a New
Mohawkian Oxycone, with...
- that
Campbelloceras is only
slightly impressed, from
Centrotarphyceras in that
Centrotarphyceras is
subquadrate and has a
central siphuncle, and from...
- Barrandeoceras, and
therefore the Barrandeoceratidae, is
derived from
Centrotarphyceras. The
inclusion of
Laureloceras expands the
range of the Plectoceratidae...
- The
Barrandeoceratidae are
derived from the
tarphyceratid genus,
Centrotarphyceras through Barrandeoceras (Flower 1984), and is the
source for the Uranoceratidae...
- Trocholitidae, and Ophidioceratidae; the
barradeoceratid group,
derived from
Centrotarphyceras,
consisting of the Barrandeoceratidae, Bickmoritidae, Nephriticeratidae...
- the
United States, ****ociated with
Proterocameroceras brainerdi and
Centrotarphyceras seelyi. A
second and
older species,
Metabaltoceras menutum, is based...
- †Centrocyrtocerina †Centrolitoceras †Centroonoceras †Centrorizoceras †
Centrotarphyceras †Chabactoceras †Chadwickoceras †Charactoceras †Charactocerina †Chazyoceras...
-
Pycnoceras Campbelloceras Aphetoceras Upper Aethoceras Bentoceras Centrotarphyceras Clytoceras Cycloplectoceras Eichwaldoceras Eurystomites Hardmanoceras...
-
concinna – or
unidentified comparable form †
Centrotarphyceras †
Centrotarphyceras bridgei †
Centrotarphyceras macdonaldi †Ceramoporella †Ceratocephala †Ceratocephala...
