Amphisbaenia Anguimorpha Gekkota Laterata Scincomorpha Serpentes †Indrasaurus Scleroglossa is a group of lizards that includes geckos, autarchoglossans (scincomorphs, anguimorphs, snakes and varanoids), and amphisbaenians.

According to most morphological analyses, Scleroglossa is the sister group of the clade Iguania,[a] which includes iguanas, chameleons, agamids, and New World lizards.

Together, Scleroglossa and Iguania make up the crown group Squamata, the smallest evolutionary grouping to include all living lizards and snakes.

Recent phylogenetic analyses based on molecular data (such as DNA sequences) nest iguanians deeper within Squamata along with snakes and anguimorphs.

A new clade Bifurcata (bifurcated tongue) has been proposed to include Iguania as a sister taxon to Anguimorpha.