(Youngina,(Squamata,(Gephyrosaurus,(Diphydontosaurus,(Planocephalosaurus,(Palaeopleurosaurus,(((Polysphenodon,Brachyrhinodon),((Clevosaurus_hudsoni,Clevosaurus_petilus),(Clevosaurus_bairdi,Clevosaurus_mcgilli))),(Homoeosaurus,(Kallimodon,(Sapheosaurus,(Pamizinsaurus,((Eilenodon,Toxolophosaurus),(Cynosphenodon,Sphenodon)))))))))))));