Gnathostomata facts for kids

Kids Encyclopedia Facts
Temporal range: Ordovician - Recent
Megalodon jaws
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: 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.


The group is traditionally a superclass, broken into three top-level groupings: Chondrichthyes, or the cartilaginous fish; Placodermi, an extinct clade of armored fish; and Teleostomi, which includes the familiar classes of bony fish, birds, mammals, reptiles, and amphibians. Some classification systems have used the term Amphirhina. It is a sister group of the jawless craniates Agnatha.


  †Placodermi  Dunkleosteus interm1DB.jpg


  Acanthodians, incl. Chondrichthyes (cartilaginous fishes)Carcharodon carcharias drawing.jpg


  Actinopterygii  Atlantic sturgeon flipped.jpg


  Amphibia  Deutschlands Amphibien und Reptilien (Salamandra salamdra).jpg


  Sauropsida  Description des reptiles nouveaux, ou, Imparfaitement connus de la collection du Muséum d'histoire naturelle et remarques sur la classification et les caractères des reptiles (1852) (Crocodylus moreletii).jpg


  Mammalia  Phylogenetic tree of marsupials derived from retroposon data (Paucituberculata).png


Gnathostomata Facts for Kids. Kiddle Encyclopedia.