-
their protoconch and
septal necks significantly different than
orthocerids.
Orthocerids flourished in the
Paleozoic Era,
giving rise to
multiple orders...
-
numerous orthocerids stretching through the Paleozoic, but it
excludes colloids,
despite colloids having a well-established
ancestry among the
orthocerids. Interpretations...
- 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...
- rock-forming, as do
certain other extinct, straight-s****ed
cephalopods (e.g.,
orthocerid nautiloids).
Studies on
exceptionally preserved specimens have revealed...
-
Siberioceras is an
extinct genus of
orthocerids of
uncertain affinity defined by
Zhuravleva (1957).
Orthocerids are
prehistoric s****ed
cephalopods included...
-
famous finds are
trilobites and the
nautiloid cephalopod including the
orthocerid order of
extinct Silurian-Devonian
orthoceratoid cephalopods. Nautiloid...
-
subsequently split off as
separate order.
Order †
Orthocerida Includes orthocerids and
pseudorthocerids Order †
Ascocerida Order †
Oncocerida Order † Discosorida...
-
Rhabdites is an
extinct genus of
orthocerids, a kind of straight-s****ed
nautiloid cephalopod.
Rhabdites -Paleobio database. Sepkoski, J.J. Jr. 2002....
- the
first chamber of
Bactroceras resembles that of
other Ordovician orthocerids, such as
Archigeisonoceras and Hedstroemoceras: it is
about 10 mm in...
-
narrow siphuncles). By the mid
Ordovician these orders are
joined by the
Orthocerids,
whose first chambers are
small and spherical, and Lituitids,
whose siphuncles...
