- 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...
-
Calhounoceras is a
genus of
actinocerids (Cephalopoda, Nautiloidea) from the
Lower Mississippian named by Troedsson, 1926. Calhounoceras,
Fossilworks PaleoDB...
- Resources,
Socorro NM.
Flower R.H. 1968, The
First Great Expansion of the
Actinocerids. Part I
Memoir 19, New
Mexico Bureau of
Mines and
Mineral Resources,...
-
narrow siphuncle that is less
common for
actinocerids. Niko,
Shuji 1998.
Kobayashiceras gifuense, a new
actinocerid cephalopod from the
Lower Devonian of...
- ray Gr**** ἀκτίς, ἀκτῖνος (aktís, aktînos) actinic, actinism, actinium,
actinocerid, actinodrome, actinoid, actinomere, actinometer, actinomorphic, Actinomyces...
- Kröger 2008 and
Teichert 1980)
separate orthoceratoids,
endocerids and
actinocerids as co-equal taxa to the Nautiloidea,
which becomes much
reduced in scope...
-
early actinocerids defined by
Shimazu and
Obata in 1938 for
actinocerids with
thick connecting rings and a
complex irregular canal system.
Actinocerids are...
-
endosiphuncular deposits penetrated by a
canal system similar to that
found in
actinocerids but
differs in the
having a
protoconch characteristic of the pseudorthocerids...
