[1] Fossils have been found from the Bull Canyon Formation of the Dockum Group outcropping in the Revuelto Creek locality in Quay County, New Mexico.

[2] Lucasuchus was first proposed to be a junior subjective synonym of Longosuchus in 1999, and several other studies have also considered it to be an invalid genus.

[3][4] However, more recent studies concluded that Lucasuchus is not congeneric with any other known aetosaur genus, and is likely to be more closely related to Desmatosuchus and Acaenasuchus than to Longosuchus.

[5] The presence of elongate lateral osteoderm horns is shared by all of these genera, which make up the subfamily Desmatosuchinae.

Lucasuchus also lacks the emarginations (or notches) on the spikes of the lateral osteoderms that are seen in Longosuchus.