In 2005, Bell and Polcyn put forward cladistic taxonomy, which classified Dallas lizards into Canglong subfamily. Although Dallas lizards have many ancestral characteristics, their soles are primitive, similar to lizards, and they are very small, but the lizard family itself is a parallel group, so Dallas lizards do not belong to the lizard family. Dallas lizard is a sister taxon of other derivative species (such as Cephalotaxus, Diplodocus and Cephalotaxus).