(Acanthostega,(Eusthenopteron,(Ichthyostega,(Crassigyrinus,((((Caerorhachis,((St_Louis_tetrapod,(Ptyonius,(Adelogyrinus,Greererpeton))),(Balanerpeton,Dendrerpeton))),(Chroniosaurus,Silvanerpeton,(Eoherpeton,(Anthracosaurus,(Proterogyrinus,(Archeria,Pholiderpeton)))),(Gephyrostegus,(Bruktererpeton,((Seymouria,(Ariekanerpeton,Discosauriscus,Utegenia)),(Paleothyris,(Casineria,Westlothiana,(Microbrachis,Saxonerpeton)))))))),(Eucritta,(Loxomma,(Baphetes,Megalocephalus)))),(Pederpes,Whatcheeria))))));