The genus contains a single species, A. bibongriensis, which is the first Mesozoic lizard to have been discovered on the Korean peninsula.

This specimen is a partial skull donated in 2008 from an uncertain stratigraphic level within the same locality where the holotype of Asprosaurus was discovered.

The specimen exhibits synapomorphies of Varanoidea and Monstersauria, and is the only known lizard skull fossil with preserved teeth in South Korea.

[3] Asprosaurus is among the largest Late Cretaceous terrestrial lizards from Asia described to date, with an estimated skull length of 18–20 cm (7.1–7.9 in).

Asprosaurus might have been able to dig into nests using powerful forelimb muscles, which is inferred based on the morphology of the scapulocoracoid and humerus.