- However,
acanthodians are not true sharks;
their close relation to
modern cartilaginous fish can lead them to be
considered "stem-sharks".
Acanthodians had...
- that are no
longer considered acanthodians. Not
counting their descendants, the
modern chondricthyans, all
acanthodians are extinct.
Extinct genera are...
-
acanthodians represent a
paraphyletic ****emblage
leading to Chondrichthyes. Some
characteristics previously thought to be
exclusive to
acanthodians are...
- that
Osteichthyes evolved from
placoderms like Entelognathus,
while acanthodians are more
closely related to
modern chondrichthyes. Teleostomi, therefore...
- the
Chondrichthyes (cartilaginous fish) and the
extinct placoderms and
acanthodians,
which have
endoskeletons primarily composed of cartilage. The vast majority...
- Ordovician-aged
microfossils of what have been
identified as
scales of
either acanthodians or "shark-like fishes", may mark Gnathostomata's
first appearance in...
-
Silurian was the
diversification of
jawed fish,
which include placoderms,
acanthodians (which gave rise to
cartilaginous fish) and
osteichthyan (bony fish,...
- of
ossified endoskeleton instead of
cartilages like the
skeletons of
acanthodians,
chondrichthyians and most placoderms.
There are
otherwise vast differences...
-
presented in 2024 is a list of new taxa of
jawless vertebrates, placoderms,
acanthodians,
fossil cartilaginous fishes, bony fishes, and
other fishes that were...
-
living cartilaginous and bony fish, as well as the
extinct placoderms and
acanthodians. Most fish are cold-blooded,
their body
temperature varying with the...
