-
Ammonoids are
extinct spiral s****ed
cephalopods comprising the
subclass Ammonoidea. They are more
closely related to
living coleoids (i.e., octopuses...
- cephalopods,
along with the
extinct ammonoids (ammonites) and
living coleoids (such as squid, octopus, and kin).
While ammonoids and
coleoids are monophyletic...
- Goniatids,
informally goniatites, are
ammonoid cephalopods that form the
order Goniatitida,
derived from the more
primitive Agoniatitida during the Middle...
-
which are
typical and
characteristic of the Carnian.
Among molluscs, the
ammonoid genus Trachyceras is
exclusive to the
lower Carnian (i.e.,
Julian of the...
-
Nannites is a
genus in the
ammonoid cephalopods in the
order Ceratitida from the
middle and
upper Tri****ic (Ladinian and Carnian) of the Alps,
named by...
- Tri****ic epoch. The
biostratigraphy is
constrained by the
presence of the
ammonoids Tirolites and Bajarunia, and conodonts. The Tirolites/Columbites beds...
-
Ammonitida or "True ammonites" are an
order of
ammonoid cephalopods that
lived from the Jur****ic
through Paleocene time periods,
commonly with intricate...
- 2 million
years ago.
During this time, the
first ammonoids appeared,
descending from
bactritoid nautiloids.
Ammonoids during this time
period were
simple and differed...
- began, 393.3 Ma.
During this time, the
first ammonoids appeared,
descending from
bactritoid nautiloids.
Ammonoids during this time
period were
simple and differed...
-
enclosed between two
adjacent septa in the
phragmocone of a
nautiloid or
ammonoid cephalopod molluscus.
These can be seen in cross-sections of a nautilus...
