Mionothropus is an extinct genus of nothrotheriine nothrotheriid sloth which existed in Peru in western Amazonia during the late Miocene age. It was first named by Gerardo De Iuliis, Timothy J. Gaudin and Matthew J. Vicars in 2011 and the type species is Mionothropus cartellei. The generic name is derived from "Mio", is a reference to the Miocene provenance of the holotype, and "nothropus" refers to the initial allocation of the holotype to this genus from the South American Pleistocene. The species name honors Dr. Castor Cartelle.

My pencil and mixed media illustrations of Mionothropus cartellei are based on LACM 4609/117533 and appeared in the following article: De Iuliis, G., T.J. Gaudin, and M.P. Vicars. A new genus and species of nothrotheriid sloth (Xenarthra, Tardigrada, Nothrotheriidae) from the late Miocene (Huayquerian) of Peru. [Paleontology, Vol. 54, Part 1, 2011, pp. 171-205.] With permission from John Wiley and Sons.