(OUTGROUP,(Acanthostega_gunnari,(Ichthyostega_stensioei,((Crassigyrinus_scoticus,(Whatcheeria_deltae,(Eoherpeton_watsoni,(Proterogyrinus_scheelei,(Archeria_crassidisca,Pholiderpeton_scutigerum))))),(Greererpeton_burkemorani,(((((Chroniosaurus_dongusensis,((Utegenia_shpinari,(Ariekanerpeton_sigalovi,((Discosauriscus_austriacus,(Discosauriscus_pulcherrimus,(Makowskia_laticephala,Spinarerpeton_brevicephalum))),(Karpinskiosaurus_secundus,(Seymouria_baylorensis,Seymouria_sanjuanensis))))),(Bruktererpeton_fiebigi,Gephyrostegus_bohemicus))),((Limnoscelis_paludis,(Diadectes_absitus,Tseajaia_campi)),(Eocaptorhinus_laticeps,Petrolacosaurus_kansensis))),(Microbrachis_pelikani,Saxonerpeton_geinitzi)),(Lethiscus_stocki,Sauropleura_pectinatascalaris)),((Dendrerpeton_acadianum,(Balanerpeton_woodi,(Ecolsonia_cutlerensis,Eryops_megacephalus))),(Baphetes_kirkbyi,Megalocephalus_pachycephalus))))))));