Gnathovorax cabreirai was named by Pacheco et al. (2019) [Gnathovorax cabreirai differs from all other known herrerasaurids based on a unique combination of character states (*local autapomorphy): three premaxillary teeth*; presence of an additonal fenestra (=oval fenestra) between the maxilla and premaxilla contact, which is located dorsal to the subnarial fenestra, though markedly smaller than the subnarial fenestra*; two well defined laminae in the antorbital fossa of the maxilla, with a depression between them*; promaxillary fenestra absent*; slender ventral ramus of the lacrimal extending caudally almost until the midpoint of the orbit*; supraoccipital trapezoidal in caudal view; anterior portion of the basioccipital articulates with the parabasisphenoid through a V-shaped suture*, transverse processes of the last dorsal vertebra lacks contact with the ilium; distal end of the scapula craniocaudally expanded relative to the more proximal shaft; distally extended ente- and ectepicondyle in the humerus; preacetabular ala of the ilium with a pointed cranial tip*; pubis with a sinuous lateral margin in cranial/caudal views and a ventrally oriented shaft in lateral view; no depressed surface (=bevel) on the craniomedial region of the distal end of the pubis; presence of an opening on the obturator plate of the ischium*; proximal portion of the femur with lacks a caudomedial tuber; tibia equals to 90% of the femoral length; and three phalanges in pedal digit V*.]. Its type specimen is CAPPA/UFSM 0009, a skeleton (An almost complete and partially articulated skeleton (lacking only part of the left shoulder girdle and part of the left forelimb).), and it is a 3D body fossil. Its type locality is Marchezan, São João do Polêsine, which is in a Tuvalian lacustrine delta plain mudstone in the Santa Maria Formation of Brazil.