eusthenopteronpanderichthysacanthostegaichthyostegacrassigyrinusloxommatidsanthracosaursseymouriamorphswestlothianadiadectomorphsamniotescolosteidstemnospondylsnectrideansmicrosaursadelogyrinidslysorophidsaistopodsCaerorhachisOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Ruta_etal_2001aa