Gnathostomata

Gnathostomata is the group of vertebrates with jaws.

The group was meant to include all jawed fish, but in modern fashion it also includes all the tetrapods as well, since they evolved from jawed fish. It is the sister group of the Agnatha, the jawless vertebrates.

The Gnathostomata first appeared in the Ordovician period and became diverse in the Devonian period, the 'Age of Fishes'. Land vertebrates appeared in the Carboniferous period.

 Subgroups 
Chondrichthyes cartilaginous fish
Acanthodii† 'spiny sharks'
Placoderms† armoured fish
Osteichthyes bony fish
Actinopterygii ray-finned fish
Sarcopterygii lobe-finned fish and land vertebrates (tetrapods)

Category:Vertebrates
Category:Chordates
Category:Animals