-
central to
subcentral siphuncles which may bear
internal deposits.
Orthoceratoids are also
characterized by
dorsomyarian muscle scars (a
small number...
-
cephalopods has been a four-fold
division (by Bather, 1888), into the
orthoceratoids, nautiloids, ammonoids, and coleoids. This
article is
about nautiloids...
- is
prevalent among the ellesmerocerids, endocerids, actinocerids,
orthoceratoids, and bactritids.
Orthocones existed from the Late
Cambrian to the Late...
- 2008). "A New
Genus of
Middle Tremadocian Orthoceratoids and the
Early Ordovician Origin of
Orthoceratoid Cephalopods". Acta
Palaeontologica Polonica...
- 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...
-
Pseudorthocerida is an
order of
generally straight longiconic orthoceratoids with a
subcentral to
marginal cyrtochoanitic siphuncle composed of variably...
- Kroger, 2008. A new
genus of
middle Tremadocian orthoceratoids and the
Early Ordovician origin of
orthoceratoid cephalopods.
Brief Report Acta Palaeontologica...
- (Furnish & Glenister, 1964),
reranked as an
order and
combined with
other orthoceratoids. They are
considered to be more
closely related to the
Orthocerida than...
- The
Ascocerida are
comparatively small,
bizarre Orthoceratoids known only from
Ordovician and
Silurian sediments in
Europe and
North America, uniquely...
