Genus: Cronopio ROUGIER, APESTEGUIA & GAETANO, 2011
Etymology: Cronopio after the fictional, bizarre creatures central to many stories by Julio Cortazar.

Species: dentiacutus ROUGIER, APESTEGUIA & GAETANO, 2011
Etymology: Latin, dentiacutus, "sharp, acutue teeth."

Holotype: MPCA 454

Locality: 'La Buitrera' facies, Rio Negro Province, Northwest Patagonia, Argentina.

Horizon: Candeleros Formation.

Biostratigraphy:

Age: Cenomanian Stage, Uppermiddle Gallic Subepoch, Lowermost Gulf Epoch, Late Early or Middle Cretaceous-Turonian Stage, Uppermost Gallic Subepoch, Lower Gulf Epoch, Early Late Cretaceous.

Material: Incomplete skull preserving a full upper dentition, but missing the braincase, part of the rostral roof and lower jaws.