Genus: Trucidocynodon OLIVEIRA, SOARES & SCHULTZ, 2010
Etymology: Latin, trucido, "to kill cruelly," regarding to its consicuosus specialziations to carnivory, and Latin, cynodon, refers to the clade Cynodontia.

Species: riograndensis OLIVEIRA, SOARES & SCHULTZ, 2010
Etymology: In reference to Rio Grande do Sul State, where the specimen was found.

Holotype: UFRGS PV-1051-T

Locality: Sitio Janner, 29°40'45"S, 53°17'34"W, Agudo Municipality (approximately 200 km east from Porto Alegre), Rio Grande do Sul State, Brazil.

Horizon: Sequence Santa Maria 2, upper half of Santa Maria Formation.

Biostratigraphy:

Age: Carnian Stage, Lower Late Triassic Epoch, Late Triassic.

Material: An almost complete specimen in which are preserved skull, the mandible, 32 pre-sacral vertebrae (possibly the whole series), 5 sacral vertebrae, some caudal vertebrae and several haemapophyses (associated to the corresponding vertebrae or disarticulated), complete pectoral girdle, almost complete right forelimb (lacking only some metacarpals and phalanges), left humerus, ulna, and fragment of the radius, complete pelvic girdle, the almost complete right hind limb (lacking some metatarsals and phalanges), left femur, 3 fragments probably from left tibia and fibula, 14 disarticulated metapodials, and phalnages (probably from the left foot), and several ribs (some associated with the corresponding vertebrae and others disarticulated and fragmented).

Paratypes:

UFRGS PV-1053-T: Right scapula, humerus, radius and ulna.

UFRGS PV-1069-T: 2 posterior trunk vertebrae, an ?anterior/?middle trunk vertebra, a vertebra of uncertain position and some ribs fragments.

UFRGS PV-1070-T: A right tibia lacking its distal end.

UFRGS PV-1071-T: A partial right ulna probably from a young individual due to its shorter length and its less ossified nature in olecraneal region.