-
Eocene fossil Antarcticeras is
sometimes considered a
descendant of the
orthocerids although this is disputed. They were most
common however from the Ordovician...
- rock-forming, as do
certain other extinct, straight-s****ed
cephalopods (e.g.,
orthocerid nautiloids).
Studies on
exceptionally preserved specimens have revealed...
-
famous finds are
trilobites and the
nautiloid cephalopod including the
orthocerid order of
extinct Silurian-Devonian
orthoceratoid cephalopods. Nautiloid...
-
possibly orthocerids. The last straight-s****ed
forms were long
thought to have
disappeared at the end of the Tri****ic, but a
possible orthocerid has been...
-
subsequently split off as
separate order.
Order †
Orthocerida Includes orthocerids and
pseudorthocerids Order †
Ascocerida Order †
Oncocerida Order † Discosorida...
-
Treptoceras is a
fossil cephalopod genus included in the
orthocerid family Proteoceratidae. It has been
found in
Ordovician rocks dated from
about 460...
-
These polished orthocerid nautiloid cephalopod fossils from
Morocco have
fully preserved septal necks and
connecting rings outlining the
shape of the siphuncle...
- family) that in some more
recent taxonomies has been
classified with the
orthocerids and
listed under the
order Lituitida.
Fossils have been
found in New...
-
orthocerid family Kionoceratidae with
scattered worldwide distribution from the
Middle Ordovician to the
Lower Permian.
Kionoceratids are
orthocerids...
-
included not only the coleoids, ammonoids, and bactritids, but also some
orthocerid families: Michelinoceratidae, Sphaerorthoceratidae, Arionoceratidae, "and...
