Pterosauromorpha (meaning "pterosaur-like forms") is one of the two basic divisions of Ornithodira that includes pterosaurs and all taxa that are closer to them than to dinosaurs and their close relatives (i.e.

[4][5][6][7] The name Pterosauromorpha was originally coined by Emil Kuhn-Schnyder and Hans Rieber (1986) for a reptilian subclass distinct from Archosauria which includes pterosaurs.

[11] First iteration of phylogenetic analysis produced by Kammerer et al. (2020) restored lagerpetids as a basal dinosauromorphs, which corresponds to the traditional point of view.

[4] In a study that used micro-CT scans, Ezcurra et al. (2020) have found additional similarities, including large semicircular canals within the bones of some lagerpetids that resemble that of pterosaurs.

It is assumed that large semicircular canals are related to arboreal, aerial or other agile forms of terrestrial locomotion as well as rapid movements.