YounginiformesRhynchocephaliaKuhneosaursPaliguanaSaurosternonPalaeagamaArchosauromorphaAgamidaeAnguidaeChamaeleontidaeCordylidaeDibamidaeGekkonidaeGymnophthalmidaeHelodermatidaeIguanidaeLacertidaeLanthanotusPygopodidaeScincidaeTeiidaeVaranusXantusiidaeXenosauridaeAmphisbaeniaSerpentesSphenodonOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Estes_etal_1988a