Stem Chordata
Vertebrata
Osteostraci
Gnathostomata
Antiarchi
Phyllolepida
Arthrodira
"Acanthodii"
Eugnathostomata
Osteichthyes
Sarcopterygii
Porolepiformes
Dipnomorpha
Rhizodontiformes
Tristichopteridae
Stegocephalia
Last modified 12/10/13