A group of heavily armoured fishes that lived during the Devonian period. They likely form a paraphyletic assemblage of groups along the vertebrate stem, although could still prove to be the monophyletic sister group of all living jawed vertebrates.
A group of heavily armoured fishes that lived during the Devonian period. They likely form a paraphyletic assemblage of groups along the vertebrate stem, although could still prove to be the monophyletic sister group of all living jawed vertebrates.