-
Nybyoceras is an
actinocerid genus ****igned to the
Armenoceratidae and
similar to
Armenoceras except for
having a
siphuncle close to the
ventral side of...
- Russia, and Australia.
Armenoceras is
thought to have
given rise to
Nybyoceras in the
Chazyan (Flower 1968),
although the
reverse was
earlier suggested...
- China, Manchuria,
derived from Wutinoceras.
Additional genera include Nybyoceras and Selkirkoceras, respectively, from the
upper Middle and
Upper Ordovician...
- The
siphuncle is
ventral but not marginal, in
general form like that of
Nybyoceras.
Upper and
lower septal necks are re****bent or
narrowly free. The canal...
-
North America, is
included in the
Nybyoceras branch of the
Armenoceratidae (Teichert, 1964),
which also
includes Nybyoceras and Megadisocosorus. Curt Teichert...
- of one of the two
branches of the
Armenoceratidae that also
includes Nybyoceras and Selkirkoceras. Curt Teichert, 1964. Actinoceratoidea,
Treatise on...
- (Flower 1957)
Lambeoceras is
found with Actinoceras, Armenoceras, and
Nybyoceras in the
Second Value Formation in New Mexico; with
Armenoceras and Selkirkoceras...
-
derived from Wutinoceras,
possibly through an
early Armenoceras or
through Nybyoceras and give rise to
Lambeoceras and to the Huroniidae. [citation needed]...
- (descendants) of Actinoceras, e.g. Lambeoceras, in some Armenoceras,
Nybyoceras, and in Gonioceras. (Flower 1957). The
parispatium is a
narrow opening...
- †Neumatoceras †Nikenautilus †Nipageroceras †Nothoceras †Notocycloceras †Nucites †
Nybyoceras †Octamerella †Oelandoceras †Offleyoceras †Ogygoceras †Ohioceras †Oligoceras...
