Colbertosaurus is a genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of traversodontid cynodont

Cynodont

Cynodontia or cynodonts are a taxon of therapsids which first appeared in the Late Permian and were eventually distributed throughout all seven continents by the Early Triassic . This clade includes modern mammals and their extinct close relatives. They were one of the most diverse groups of...

 from the Middle Triassic

Middle Triassic

In the geologic timescale, the Middle Triassic is the second of three epochs of the Triassic period or the middle of three series in which the Triassic system is divided. It spans the time between 245 ± 1.5 Ma and 228 ± 2 Ma...

 of Argentina

Argentina

Argentina , officially the Argentine Republic , is the second largest country in South America by land area, after Brazil. It is constituted as a federation of 23 provinces and an autonomous city, Buenos Aires...

. A single species C. muralis was named in 1954 from a fragmentary jaw. Colbertosaurus was originally placed in Ictidosauria, an outdated name for a group of cynodonts that includes tritheledontids. It is the only cynodont known from the Potrereillos Formation and is similar in appearance to Pascualgnathus

Pascualgnathus

Pascualgnathus is a genus of traversodontid cynodont from the Middle Triassic of Argentina. Fossils have been found from the Río Seco de la Quebrada Formation. The type species P. polanskii was named in 1966.-Description:...

from the Puesto Viejo Formation. The similarity between the two traversodontids has been used to correlate the two formations.