Griphotherion was a small "rodent-like" notoungulate, similar to members of the families Archaeohyracidae, Hegetotheriidae, and Mesotheriidae. It had many unique features that are not seen in other notoungulates, and has therefore not been placed in any notoungulate family.[1]
^García-López, D.A.; Powell, J.E. (2011). "Griphotherion peiranoi, gen. et sp. nov., a new Eocene Notoungulata (Mammalia, Meridiungulata) from northwestern Argentina". Journal of Vertebrate Paleontology. 31 (5): 1117–1130. Bibcode:2011JVPal..31.1117G. doi:10.1080/02724634.2011.599464. hdl:11336/70202.