(Panderichthys,((Elginerpeton,Obruchevichthys),((Ichthyostega,Ventastega),(Metaxygnathus,(Acanthostega,(Whatcheeria,(Tulerpeton,(Crassigyrinus,(Greererpeton,(Megalocephalus,(Cochleosaurus,Phonerpeton,((Gephyrostegus,(Pholiderpeton,Proterogyrinus)),(Eoherpeton,Caerorhachis)),(Balanerpeton,Platyrhinops),(Microbrachis,Discosauriscus,(Diploceraspis,Sauropleura,(Eocaptorhinus,Ophiacodon))))))))))))));