SQUAMATA OPPEL, 1811

KEQIN, GAO & NORELL, MARK A., 2000, Taxonomic Composition And Systematics Of Late Cretaceous Lizard Assemblages From Ukhaa Tolgod And Adjacent Localities, Mongolian Gobi Desert, Bulletin of the American Museum of Natural History 2000 (249), pp. 1-118 : 11

SQUAMATA OPPEL, 1811

IGUANIA COPE, 1864

DEFINITION: The most recent common ancestor of Iguanidae *, Agamidae * and Chamaeleonidae , and all of its descendants (Estes et al., 1988).

REMARKS: The monophyly of the Iguania is well supported by a number of character states (Estes et al., 1988). The Iguania include extant familial groups such as the Iguanidae *, Agamidae *, and the Chamaeleonidae , and fossil groups such as the Arretosauridae Gilmore, 1943 . The monophyly of the Iguanidae * and the Agamidae * is still questionable (Frost and Etheridge, 1989), but there is evidence to support the splitting of the Iguania into two major subgroups: the nonacrodontan iguanians and the acrodontans (Macey et al., 1997).