Gymnophthalmus (Merrem 1820) extant, commonly referred to as a tegu or a microteiid due to its small size. Here, derived from a sister to Chalcides, Gymnophthalmus was a sister to Sirenoscincus and later burrowing skinks and amphisbaenids.
Distinct from Chalcides, the skull of Gymnophthalmus had a shorter rostrum, but a longer premaxilla, especially the ascending process, which split the nasals and contacted the frontals. The quadrate was curved, not sharply bent. The internal nares open medially.
Gymnophthalmus has a cylindrical body, short, small limbs, recessed ear openings and the medial finger, digit 1 is greatly reduced. Visually this lizard had but four fingers. |