-
North America including Greenland,
Armenoceras has been
found in
northern Europe, Russia, and Australia.
Armenoceras is
thought to have
given rise to Nybyoceras...
-
Armenoceratidae and
similar to
Armenoceras except for
having a
siphuncle close to the
ventral side of the s****. As with
Armenoceras,
Nybyoceras has a medium...
- chambers, more so than in
Ormoceras or
Lambeoceras but not as much as in
Armenoceras. (Flower 1957) The
diameter typically becomes smaller with
respect to...
-
Lambeoceras is
found with Actinoceras,
Armenoceras, and
Nybyoceras in the
Second Value Formation in New Mexico; with
Armenoceras and
Selkirkoceras in the Burnam...
- to
Armenoceras but with a short,
slightly curved,
breviconic s****. The
siphuncle is in
contact with the
ventral wall,
unlike that of
Armenoceras in which...
- rise
through Armenoceras to
Gonioceras in the Chazyan, and
later in the
Middle Ordovician,
possibly through either an
early Armenoceras or Nybyoceras...
- s****,
slightly curved at the apex, a
siphuncle narrower than that of
Armenoceras but with
segments still wider than long, and an
arched endosiphuncular...
- Cheol-Soo), where, in Korea, it is ****ociated with the actinocerids,
Armenoceras, Ormoceras, and Selkirkoceras.
Paleontology portal Marine life portal...
-
Actinoceratids are
derived from Wutinoceras,
possibly through an
early Armenoceras or
through Nybyoceras and give rise to
Lambeoceras and to the Huroniidae...
-
wutinocerid genus, Adamsoceras.
Gonioceras is an
offshoot of an
early Armenoceras;
Lambeoceras and
Huronia are
offshoots of a
later Actinoceras. The Actinoceratidae...
