-
Ammonoids are extinct, (typically) coiled-s****ed
cephalopods comprising the
subclass Ammonoidea. They are more
closely related to
living octopuses, squid...
- cephalopods,
along with the
extinct ammonoids (ammonites) and
living coleoids (such as squid, octopus, and kin).
While ammonoids and
coleoids are monophyletic...
- Tri****ic epoch. The
biostratigraphy is
constrained by the
presence of the
ammonoids Tirolites and Bajarunia, and conodonts. The Tirolites/Columbites beds...
- Goniatids,
informally goniatites, are
ammonoid cephalopods that form the
order Goniatitida,
derived from the more
primitive Agoniatitida during the Middle...
- 99 million
years ago.
During this time, the
first ammonoids appeared,
descending from
bactritoid nautiloids.
Ammonoids during this time
period were
simple and differed...
-
period (231
million years ago). They are
considered ancestors of the
ammonoids, as well as of the
coleoids (octopus, squid, cuttlefish, and the extinct...
-
Turrilites is a
genus of
helically coiled ammonoid cephalopods from the
lower part of the
Upper Cretaceous (Cenomanian and Turonian);
generally included...
-
Clymeniida is an
order of
ammonoid cephalopods from the
Upper Devonian characterized by
having an
unusual dorsal siphuncle. They
measured about 4 cm (1...
-
agoniatitid ammonoids would die out in the
Taghanic event in the
upper middle Givetian.
Goniatite ammonoids would give rise to
further ammonoid orders, thus...
- Ammonitida, or true ammonites, are an
order of
ammonoid cephalopods that
lived from the Jur****ic
through Paleocene time periods,
commonly with intricate...
