(Seymouria,((Limnoscelidae,Diadectidae),(Synapsida,((Mesosauridae,((Eunotosaurus_africanus,Millerettidae),(Australothyris_smithi,(Microleter_mckinzieorum,(((Eudibamus_cursorius,Belebey_vegrandis),(Nyctiphruretus_acudens,(((Bradysaurus,(Pareiasuchus,Scutosaurus_karpinskii)),((Macroleter_poezicus,Tokosaurus_perforatus),(Bashkyroleter_bashkyricus,Nycteroleter_ineptus,(Bashkyroleter_mesensis,Emeroleter_levis)))),(Procolophon_trigoniceps,(Owenetta,Barasaurus))))),(Acleistorhinus_pteroticus,Lanthanosuchus_watsoni)))))),(Captorhinidae,(Paleothyris,(Araeoscelidia,Younginiformes))))))); (Seymouria,((Limnoscelidae,Diadectidae),(Synapsida,((Mesosauridae,((Eunotosaurus_africanus,Millerettidae),(Microleter_mckinzieorum,(Australothyris_smithi,(((Eudibamus_cursorius,Belebey_vegrandis),(Nyctiphruretus_acudens,(((Bradysaurus,(Pareiasuchus,Scutosaurus_karpinskii)),((Macroleter_poezicus,Tokosaurus_perforatus),(Bashkyroleter_bashkyricus,Nycteroleter_ineptus,(Bashkyroleter_mesensis,Emeroleter_levis)))),(Procolophon_trigoniceps,(Owenetta,Barasaurus))))),(Acleistorhinus_pteroticus,Lanthanosuchus_watsoni)))))),(Captorhinidae,(Paleothyris,(Araeoscelidia,Younginiformes)))))));