-
central to
subcentral siphuncles which may bear
internal deposits.
Orthoceratoids are also
characterized by
dorsomyarian muscle scars (a
small number...
-
meaning "horn", also
known as the Michelinocerida, is an
order of
extinct orthoceratoid cephalopods that
lived from the
Early Ordovician (490 million years...
- 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...
-
Lituitida is an
order of
orthoceratoid cephalopods. They
correspond to the
family Lituitidae of the
Treatise (Furnish & Glenister, 1964),
reranked as...
-
Pseudorthocerida is an
order of
generally straight longiconic orthoceratoids with a
subcentral to
marginal cyrtochoanitic siphuncle composed of variably...
- Endoceratoidea, Multiceratoidea, and Orthoceratoidea. The Ordovician-Tri****ic
Orthoceratoids are
ancestral to post-Paleozoic
groups such as
ammonoids (ammonites)...
-
Dissidocerida is an
order of
Early Ordovician to the
Early Silurian orthoceratoid cephalopods in
which the
siphuncle has a
continuous lining or a longitudinal...
-
Society 623:1-81 B. Kröger, M. S. Beresi, and E. Landing. 2007.
Early orthoceratoid cephalopods from the
Argentine Precordillera (Lower-Middle Ordovician)...
- (camerae) of
endocerids are
always free of
organic deposits,
unlike orthoceratoid cephalopod orders such as the
Orthocerida and Actinocerida. Endocerids...
