Dromomeron

Dromomeron (meaning "running femur") is a genus of lagerpetonid dinosauromorph archosaur that lived around 220 to 211.9 ± 0.7 million years ago.[1] The genus containing species known from Late Triassic-age rocks of the southwestern United States and northwestern Argentina. It is described as most closely related to the earlier Lagerpeton of Argentina, but was found among remains of true dinosaurs like Chindesaurus, indicating that the first dinosaurs did not immediately replace related groups.[2]

Based on the study of the overlapping material of Dromomeron and Tawa hallae, Christopher Bennett proposed that the two taxa were conspecific, forming a single growth series of Dromomeron.

Description
It is known from partial remains, largely from the hindlimbs,[2][4] which indicate an animal with an overall length of 1 meters (3.3 ft).

Classification
The bones of Dromomeron are most similar to those of the older dinosauromorph Lagerpeton,[2] and the two animals have been classified together in a clade Lagerpetonidae.[4]

Cladogram simplified after Kammerer, Nesbitt & Shubin (2012):