Key to Lizard Infraorders

3a. If body osteoderms present, scales are large, imbricate, and body has lateral fold between the axilla and groin; tongue thin, highly protrusible (=head length or more), and deeply bifid, fitting into a sheath in the floor of the mouth

Anguimorpha

3b. Osteoderms lacking; head distinct from neck; dorsal scales granular, but imbricate; limbs present, with 5 fingers and 4-5 toes; tongue broad and flat, slightly protrusible, or long and cylindrical, protrusible for length of body

IGUANIA