Herrerasauridae is a family of carnivorous dinosaurs, possibly basal to either theropods or even all of saurischians, or even their own branching from Dracohors, separate from Dinosauria altogether.

The pubic bone has a derived structure, being rotated somewhat posteriorly and folded to create a superficially tetanuran-like terminal expansion, especially prominent in H. ischigulastensis.

Grzegorz Niedźwiedzki, Stephen L. Brusatte et al. (2014) described a European putative member of the group on the basis of Norian age fossils discovered in Poland.

[17] The discovery of the Herrerasaurid Gnathovorax indicates that the family falls outside the Theropoda and Sauropodomorpha in the cladistic analysis undertaken on the genus when it was described, but remains squarely within Saurischia as basal members of the order.

[18][19] An unnamed herrerasaurid from the Carnian of Brazil was described and possibly belongs to a new morphotype of relatively large proportions, informally known as the "Big Saturnalia".

[26] Staurikosaurus Herrerasaurus Sanjuansaurus Chindesaurus Sauropodomorpha Ornithischia Eoraptor Tawa Eodromaeus Liliensternus Neotheropoda Baron & Williams (2018) found Herrerasauria (including Daemonosaurus, Caseosaurus and Saltopus) outside Dinosauria.

[12] A similar result was provided by the phylogenetic analysis by Cau, 2018:[27] †Silesauridae (including Pisanosaurus) †Staurikosaurus †Herrerasaurus †Sanjuansaurus †Daemonosaurus †Tawa †Sauropodomorpha †Eodromaeus †Ornithischia Theropoda Novas et al., 2021 revised the fossil record of South American early dinosaurs and supported that Herrerasauria is part of Saurischia but diverging earlier than both Sauropodomorpha or Theropoda, and further corroborated with the hypothesis that Chindesaurus, Daemonosaurus and Tawa are members of the clade.