Pleurodont lizards with well-developed limbs; without temporal bony arches; postthoracic ribs united across the abdomen.
- Pleurodont; tongue broad and thick, not protractile; no osteoderms. America, Madagascar and Fiji Islands.
In their general structure the Iguanidae closely resemble the Agamidae, from which they differ mainly by the pleurodont dentition.
- Pleurodont; solid teeth; anterior part of tongue slightly emarginate and retractile, and covered with flat papillae; no osteoderms. Mexico.
- Pleurodont; teeth solid, sometimes (Ophiosaurus) grooved; anterior part of tongue emarginate and retractile into the posterior portion; osteoderms on the body, and especially on the head where they are roofing over the temporal fossa; entirely zoophagous and ovo-viviparous.
- Pleurodont; tongue short, villose, scarcely protractile, feebly nicked at the tip. With osteoderms at least upon the skull, where they roof in the temporal region.
- Pleurodont; tongue very short and scaly; no osteoderms; supratemporal fossa roofed over by the cranial bones; eyes devoid of movable lids; tympanum exposed; femoral pores present; limbs and tail well developed.
IGUANA, systematically Iguanidae (Spanish quivalent of Carib iwana), a family of pleurodont lizards, comprising about 50 genera and 300 species.
- Pleurodont, snake-shaped, covered with roundish, imbricating scales.