- hypothetical.
Polydesmia was once
thought to be the
ancestral form of the
actinocerids, and was
derived from the
ellesmeroceriid Bathmoceras. However, it turned...
-
million years ago
during the Carboniferous.
Although they
resemble earlier actinocerids they are now
thought to
belong to the
Pseudorthocerida Rayonnoceras is...
-
nautiloid cephalopods, is
prevalent among the ellesmerocerids, endocerids,
actinocerids, orthoceratoids, and bactritids.
Orthocones existed from the Late Cambrian...
-
Huronia is an
actinocerid genus included in the
Huroniidae along with
Discoactinoceras and Huroniella,(Teichert 1964).
Huronia is
characterized by long...
- ray Gr**** ἀκτίς, ἀκτῖνος (aktís, aktînos) actinic, actinism, actinium,
actinocerid, actinodrome, actinoid, actinomere, actinometer, actinomorphic, Actinomyces...
-
Gonioceras is an
extinct genus of
actinocerid nautiloidean cephalopods typified by a broad, low s****;
flattened ventrally,
convexly rounded dorsally;...
-
Lambeoceras is a
genus of
large actinocerids with a
convexly lenticular cross section from the
Upper Ordovician of
North America and the sole representative...
-
nautiloid cephalopods of the
Wutinoceratidae family. It
exhibits orthoconic actinocerids with
ventral siphuncles composed of
broadly expanded segments. Wutinoceras...
-
early actinocerids defined by
Shimazu and
Obata in 1938 for
actinocerids with
thick connecting rings and a
complex irregular canal system.
Actinocerids are...
- ray Gr**** ἀκτίς, ἀκτῖνος (aktís, aktînos) actinic, actinism, actinium,
actinocerid, actinodrome, actinoid, actinomere, actinometer, actinomorphic, Actinomyces...
