-
Nautiloids are a
group of
marine cephalopods (Mollusca)
which originated in the Late
Cambrian and are
represented today by the
living Nautilus and Allonautilus...
- is the long, cone-shaped s****
belonging to
several species of
ancient nautiloid cephalopod—the
prehistoric ancestors of today's
marine cephalopod mollusks...
- "straight", and κέρας (kéras),
meaning "horn", is a
genus of
extinct nautiloid cephalopod restricted to
Middle Ordovician-aged
marine limestones of the...
-
chambers enclosed between two
adjacent septa in the
phragmocone of a
nautiloid or
ammonoid cephalopod molluscus.
These can be seen in cross-sections...
- found. The
septal curvature in
nautiloids and
ammonoids also
differ in that the
septa curves towards the
opening in
nautiloids, and away from the opening...
- This list of
nautiloids is a
comprehensive listing of all
genera that have ever been
included in the
subclass Nautiloidea,
excluding purely vernacular...
-
became dominant during the
Ordovician period,
represented by
primitive nautiloids. The
class now
contains two, only
distantly related,
extant subclasses:...
- (éndon),
meaning "inside", and κέρας (kéras),
meaning "horn", is an
extinct nautiloid order, a
group of
cephalopods from the
Lower Paleozoic with cone-like...
-
descending from
bactritoid nautiloids.
Ammonoids during this time
period were
simple and
differed little from
their nautiloid counterparts.
These ammonoids...
-
Lyecoceras is a
gender of
slender endogastrically curved orthocerids, so
determined by
identification of the
hyponomic sinus on the
concave side. The siphuncle...
