Diploglossa is a clade of neoanguimorphs represented by the families Xenosauridae, Diploglossidae, Anniellidae and Anguidae, the latter three placed in the superfamily Anguioidea. In the past the Chinese crocodile lizard was classified as a xenosaurid; current molecular work has shown evidence the species related to varanoids in the clade Paleoanguimorpha.
Below is the phylogeny of the neoanguimorph lineages after Pyron et al. (2013):
Xenosauridae (knob-scaled lizards)
Diploglossidae (galliwasps)
Anniellidae (American legless lizards)
Anguidae (glass lizards and alligator lizards)