What is Gnathostomata?
{{Automatic Taxobox | name = Gnathostomata | fossil_range = [[Ordovician]] - Recent | image = Megalodon jaw.jpg | image_width= 200px | image_caption = ''Megalodon'' jaws | taxon = Gnathostomata }} '''Gnathostomata''' is the group of [[vertebrate]]s with [[jaw]]s. The group was meant to include all jawed [[fish]], but in modern fashion it also includes all the [[Tetrapod|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' *[[Placoderm]]s† armoured fish *[[Osteichthyes]] bony fish **[[Actinopterygii]] ray-finned fish **[[Sarcopterygii]] lobe-finned fish and land vertebrates (tetrapods) {{wikispecies|Gnathostomata}} [[Category:Vertebrates]]