Genus: Teyujagua PINHEIRO, FRANCA, LACERDA, BUTLER, & SCHULTZ, 2016
Etymology: Genus named after Teyu Yagua, one of the seven legandary beasts in the mythology of the Guarani ethnic group, who occupied a large territory of cental east South America, including the type locality of the new species: Teyu yagua, literally meanng 'fierce lizard' is commonly represented as a dog-headed lizard.

Species: paradoxa PINHEIRO, FRANCA, LACERDA, BUTLER, & SCHULTZ, 2016
Etymology: Greek, paradoxa, "paradoxical, unexpected": Owing to its unusual ombination of plesimorphic and derived characters.

Holotype: UNIPAMPA 653

Locality: Sao Francisco de Assis municipality, Rio Grande do Sul State, Soutehrn Brazil.

HorizonSanga do Cabral Formation.

Biostratigraphy:

Age:Induan to early Olenkian Stage, Scythian Epoch, Early Triassic.

Material: An almost complete, well-preserved skull with associated cervical vertebrae.