Gracilisuchus stipanicicorum (Romer 1972) Ladinian, Middle Triassic, ~230 mya, 30 cm long, is the basalmost archosaur. It was derived from as sister to Turfanosuchus and preceded both SMNS 12591 at the base of the crocodylomorpha and PVL 4597 at the base of the dinosaurs. it was also basal to Saltopus and Scleromochlus.
Gracilisuchus was originally considered an ornithosuchid by Romer (1972). Others considered it to nest between Parasuchus and Stagonolepis (Benton and Clark 1988), as the sister to Postosuchus (Juul 1994) or Postosuchus and Erpetosuchus (Benton and Walker 2002)
Distinct from Turfanosuchus, Gracilisuchus was smaller overall, with a shorter torso and a wider, flatter skull.
The cervicals were more robust and their ribs were more robust and strongly angled. The dorsal ribs had costal processes that proximally widened each one. The tail was shorter with deeper chevrons. The scapula was smaller. The coracoid had an anterior embayment. The ilium had a horizontal dorsal margin. The simple mesotarsal hinge ankle was present. The metatarsals were compact. Digit 5 was absent.