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Ammonoidea
Ammonites
are an
extinct
group of marine
mollusc
animals in the
subclass
Ammonoidea
of the
class
Cephalopoda
. These
molluscs
are more closely related to living
coleoids
(i.e.,
octopuses
,
squid
, and
cuttlefish
) than they are to shelled
nautiloids
such as the living
Nautilus
species. The earliest ammonites appear during the
Devonian
, and the last species died out during the
Cretaceous–Paleogene extinction event
.
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