This is an accepted version of this page Deltadromeus (meaning "delta runner") is a genus of theropod dinosaur from the Aoufous Formation of Morocco.

[6][7][8][9] The holotype of Deltadromeus agilis (museum catalogue number SGM-Din2) is a partial skeleton of an animal which is estimated to have measured 8 metres (26 ft) long.

[10] A number of specimens (catalogued under IPHG 1912 VIII) were originally considered by Ernst Stromer to be conspecific with Bahariasaurus,[11] but were referred to Deltadromeus by Paul Sereno in 1996.

These referred specimens, if legitimately assigned to Deltadromeus, would have indicated that members of the genus could grow up to 12.2 metres (40 ft) in length, approximately the size of a Tyrannosaurus rex.

According to the writers of the paper, resolving the phylogenetic positions of Gualicho, Aoniraptor, Deltadromeus and megaraptorans is one of the most critical issues presently facing theropod systematics.

The original description of Deltadromeus in 1996 found that it was a fairly basal coelurosaur, only slightly more advanced than the Late Jurassic genus Ornitholestes.

[4] A 2018 study by Porfiri et al. has supported the idea that Gualicho and megaraptorans were basal coelurosaurs, outside of both Neovenatoridae and Tyrannosauroidea.