-
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...
-
somewhat simpler,
being either straight or
slightly curved,
whereas later ammonoids showed suture patterns of
increasing complexity. One
explanation for this...
-
Maximites is a
genus of Late
Carboniferous ammonoids.
Adult specimens were the
smallest known ammonoids, only at
about 1 cm (0.39 in) in
diameter of s****...
-
Ammonitida or "True ammonites" are an
order of
ammonoid cephalopods that
lived from the Jur****ic
through Paleocene time periods,
commonly with intricate...
- However,
ammonoid fossils switch over to the
lower Acutimitoceras (Stockumites)
genozone (UD VI-F),
indicating that post-Devonian
ammonoids were beginning...
-
chambers (camerae) of the s**** of a cephalopod,
namely nautiloids or
ammonoids. As the
creature grows, its body
moves forward in the s**** to a new living...
- 2 million
years ago.
During this time, the
first ammonoids appeared,
descending from
bactritoid nautiloids.
Ammonoids during this time
period were
simple and differed...
-
muscle attachments however make it
unlikely that they were as
agile as
ammonoids or
modern cephalopods. They most
likely fed on
trilobites and
small arthropods...
- the
superficially similar Baculites and
related Cretaceous orthoconic ammonoids. Both are long and
tubular in form, and both are
common items for sale...
