-
Eocene fossil Antarcticeras is
sometimes considered a
descendant of the
orthocerids although this is disputed. They were most
common however from the Ordovician...
-
famous finds are
trilobites and the
nautiloid cephalopod including the
orthocerid order of
extinct Silurian-Devonian
orthoceratoid cephalopods. Nautiloid...
- rock-forming, as do
certain other extinct, straight-s****ed
cephalopods (e.g.,
orthocerid nautiloids).
Studies on
exceptionally preserved specimens have revealed...
-
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...
- 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...
-
Lyecoceras is a
gender of
slender endogastrically curved orthocerids, so
determined by
identification of the
hyponomic sinus on the
concave side. The...
-
Geisonoceras is an
extinct orthocerid genus named by Hyatt, 1884, and type for the
Geisonoceratidae established by
Zhuravleva in 1959.
Fossils of Geisonoceras...
-
These polished orthocerid nautiloid cephalopod fossils from
Morocco have
fully preserved septal necks and
connecting rings outlining the
shape of the siphuncle...
-
Jonesoceras is a
genus of
orthocerids from the
Silurian of
Bohemia named by Barscov, 1960,
included in the Geisonoceratidae. Also
named by him, from the...
