Saurischia Theropoda Herrerasauria Herrerasauridae [Carnivore]
Several taxa commonly considered the oldest known dinosaurs. A clade of basal theropod dinosaurs.
Herrerasaurus ischigualastensis - Ischigualasto Formation
Ischisaurus cattoi - Ischigualasto Formation
Sanjuansaurus gordilloi - Ischigualasto Formation
Note: Aliwalia was more advanced than Herrerasaurus, and was as large as Allosaurus. Although referred to Herrerasauridae by Galton in 1985, Sues believes it is Dinosauria incertae sedis.