The holotype specimen, CAPPA/UFSM 0009, is an almost complete and partially articulated skeleton, lacking only portions of the left shoulder girdle and left forelimb.
It was found in 2014 at the Marchezan site, in the municipality of São João do Polêsine, Rio Grande do Sul, Brazil.
This locality preserved rocks from Santa Maria Formation in the Candelária Sequence of the Paraná Basin.
The skeleton was fossilized within a mudstone layer, along with small articulated skeletons of prozostrodont cynodonts.
This mudstone layer was then covered by a layer of sandstone containing disarticulated rhynchosaur remains.
These fossil remains are indicative of a diverse community of animals at Marchezan.
Stratigraphically correlated beds from a nearby site were dated as the middle of the Carnian stage of the Late Triassic, circa 233.23 ± 0.73 million years ago.

The monospecific genus was named and described by Cristian Pacheco, Rodrigo Temp Müller, Max Langer, Flávio Augusto Pretto, Leonardo Kerber and Sérgio Dias da Silva in an article published in 2019.
The generic name is derived from the Greek gnathos, jaw, and the Latin vorax, "voracious", from vorō (“devour”) + −āx (“inclined to”).
The specific epithet was given in honour of Dr. Sérgio Furtado Cabreira, the palaeontologist who found the specimen.
The holotype specimen, CAPPA/UFSM 0009, is an almost complete and partially articulated skeleton, lacking only portions of the left shoulder girdle and left forelimb. It was found in 2014 at the Marchezan site, in the municipality of São João do Polêsine, Rio Grande do Sul, Brazil. This locality preserved rocks from Santa Maria Formation in the Candelária Sequence of the Paraná Basin. The skeleton was fossilized within a mudstone layer, along with small articulated skeletons of prozostrodont cynodonts. This mudstone layer was then covered by a layer of sandstone containing disarticulated rhynchosaur remains. These fossil remains are indicative of a diverse community of animals at Marchezan. Stratigraphically correlated beds from a nearby site were dated as the middle of the Carnian stage of the Late Triassic, circa 233.23 ± 0.73 million years ago. 
The monospecific genus was named and described by Cristian Pacheco, Rodrigo Temp Müller, Max Langer, Flávio Augusto Pretto, Leonardo Kerber and Sérgio Dias da Silva in an article published in 2019. The generic name is derived from the Greek gnathos, jaw, and the Latin vorax, "voracious", from vorō (“devour”) + −āx (“inclined to”). The specific epithet was given in honour of Dr. Sérgio Furtado Cabreira, the palaeontologist who found the specimen.
Gnathovorax