DiadectomorphaSeymouriamorphaCaseidaeMesosauridaeMillerettidaeProcolophonidaeRomeria_texanaProtocaptorhinusRhiodenticulatusCaptorhinus_laticepsCaptorhinus_agutiLabidosaurusLabidosaurikosSaurorictusConcordiaProtorothyrisPaleothyrisCephalerpetonAnthracodromeusBrouffiaCoelostegusHylonomusThuringothyrisPetrolacosaurusAraeoscelisOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Muller_et_Reisz_2006a