- vertebrates.
Gnathostome diversity comprises roughly 60,000 species,
which accounts for 99% of all
living vertebrates,
including humans. Most
gnathostomes have...
- (a-) 'without' and γνάθος (gnáthos) 'jaws') is a
paraphyletic infraphylum of non-
gnathostome vertebrates, or
jawless fish, in the
phylum Chordata,
subphylum Vertebrata...
-
Acanthodii or
acanthodians is an
extinct class of
gnathostomes (jawed fishes). They are
currently considered to
represent a
paraphyletic grade of various...
- †Placodermi (Paleozoic
armoured forms;
paraphyletic in
relation to all
other gnathostomes)
class Chondrichthyes (cartilaginous fish; 900+ species)
class †Acanthodii...
-
closely integrated as in
modern gnathostomes.
These teeth were
likely homologous to the
teeth of
other gnathostomes. One of the
largest known arthrodires...
-
Vertebrata └─Infraphylum
Gnathostomata ├─Placodermi —
extinct (armored
gnathostomes) └Eugnathostomata (true
jawed vertebrates) ├─Acanthodii (stem cartilaginous...
- the
squamosal (a
small cranial bone) meet to form the joint. In most
gnathostomes,
including early therapsids, the
joint consists of the
articular (a small...
-
armored fish (ostracoderms)
declined in diversity,
while the
jawed fish (
gnathostomes)
simultaneously increased in both the sea and
fresh water.
Armored placoderms...
- Lijian; Jia, Liantao; Qiao, Tuo; Zhu, Min (September 2022). "The
oldest gnathostome teeth". Nature. 609 (7929): 964–968. Bibcode:2022Natur.609..964A. doi:10...
-
reveal that they
probably originated in the
Early Cambrian. The
first gnathostome (jawed fish) may have
appeared in the Late
Ordovician epoch. Chitinozoans...
