Arsinoitherium

Arsinoitherium is an extinct genus of paenungulate mammal related to elephants, sirenians, hyraxes and the extinct desmostylians, as well as to other extinct embrithopods. These species were elephant-like herbivores that lived during the late Eocene and the early Oligocene of northern Africa from 36 to 30 million years ago, in areas of tropical rainforest and at the margin of mangrove swamps. A newly discovered species, Arsinoitherium giganteum, lived in Ethiopia ~27 million years ago.

Etymology
The generic name Arsinoitherium comes from Queen Arsinoe after whom the Fayum, the region in which the fossils were found, was called during Ptolemaic times, and the Greek: θηρίον (therion), "beast". The species epithet of the type species, A. zitteli, was given to it in honor of the eminent German paleontologist Karl Alfred von Zittel, regarded by some as the pioneer of paleontology in Egypt.

Discovery and fossil relatives
While the Fayum Oasis is the only site where complete skeletons of Arsinoitherium fossils were recovered, remnants of earlier relatives have been found in south-eastern Europe and Mongolia, in the form of jaw fragments. These earlier arsinoitheres have yet to be formally described. The best known (and first described) species is A. zitteli. A second species, A. giganteum, was discovered in the Ethiopian highlands of Chilga in 2003. The fossil teeth, far larger than those of A. zitteli, date back to around 28-27 million years ago[2] The Mongolian material has been named Radinskya yupingae, while the European material has been given the nomen dubium of Crivadiatherium iliescui, and the Turkish material has been named Palaeoamasia kansui (also nomen dubium).