-
central to
subcentral siphuncles which may bear
internal deposits.
Orthoceratoids are also
characterized by
dorsomyarian muscle scars (a
small number...
- is
prevalent among the ellesmerocerids, endocerids, actinocerids,
orthoceratoids, and bactritids.
Orthocones existed from the Late
Cambrian to the Late...
-
cephalopods has been a four-fold
division (by Bather, 1888), into the
orthoceratoids, nautiloids, ammonoids, and coleoids. This
article is
about nautiloids...
- 2008). "A New
Genus of
Middle Tremadocian Orthoceratoids and the
Early Ordovician Origin of
Orthoceratoid Cephalopods". Acta
Palaeontologica Polonica...
-
Tienocerasis an
orthoceratoid genus from the
Permian of
China (Hunan).
Orthoceratoids are
slender conical or near cylindrical, orthoconic,
nautiloid cephalopods...
- Endoceratoidea, Multiceratoidea, and Orthoceratoidea. The Ordovician-Tri****ic
Orthoceratoids are
ancestral to post-Paleozoic
groups such as
ammonoids (ammonites)...
-
several plesiomorphic ("primitive")
traits which are
absent in
other orthoceratoids:
Cameral and
endosiphuncular deposits are absent, and the siphuncle...
-
Society 623:1-81 B. Kröger, M. S. Beresi, and E. Landing. 2007.
Early orthoceratoid cephalopods from the
Argentine Precordillera (Lower-Middle Ordovician)...
-
including enormous examples of ammonoids, belemnoids, nautiloids,
orthoceratoids, teuthids, and vampyromorphids. In
terms of m****, the
largest of all...
- The
Ascocerida are
comparatively small,
bizarre Orthoceratoids known only from
Ordovician and
Silurian sediments in
Europe and
North America, uniquely...
