-
Nautiloids are a
group of
marine cephalopods (Mollusca)
which originated in the Late
Cambrian and are
represented today by the
living Nautilus and Allonautilus...
-
Orthoceras is a
genus of
extinct nautiloid cephalopod restricted to
Middle Ordovician-aged
marine limestones of the
Baltic States and Sweden. This genus...
- is the long, cone-shaped s****
belonging to
several species of
ancient nautiloid cephalopod—the
prehistoric ancestors of today's
marine cephalopod mollusks...
-
coleoids (i.e., octopuses,
squid and cuttlefish) than they are to s****ed
nautiloids (such as the
living Nautilus). The
earliest ammonoids appeared during...
-
became dominant during the
Ordovician period,
represented by
primitive nautiloids. The
class now
contains two, only
distantly related,
extant subclasses:...
-
chambers enclosed between two
adjacent septa in the
phragmocone of a
nautiloid or
ammonoid cephalopod molluscus.
These can be seen in cross-sections...
- Ward, P.D. & W.B.
Saunders 1997. Allonautilus: a new
genus of
living nautiloid cephalopod and its
bearing on
phylogeny of the Nautilida.
Journal of Paleontology...
- With only a
handful of
species surviving today, the
Nautiloids flourished during the
early Paleozoic era, from the Late Cambrian,
where they constituted...
-
trilobites and the
nautiloid cephalopod including the
orthocerid order of
extinct Silurian-Devonian
orthoceratoid cephalopods.
Nautiloid cephalopods are...
- be the
upper surface. All
cephalopods with
external s****
except the
nautiloids became extinct by the end of the
Cretaceous period 65Â million
years ago...
