What is "chasicotherium"

Chasicotherium rothi is an extinct genus of a large notoungulate mammal known originally from a partial skull with mandible discovered in the Chasico Formation, in the stream of the same name of the Party of Villarino, Province of Buenos Aires, Argentina. The sediments in which the animal remains were discovered have an antiquity between 10 and 9 million years. Its weight was approximately one ton, being the largest and most recent member of the family Homalodotheriidae. It was a great herbivore of the Tertiary Pampas, closely related with Homalodotherium, with it shares the reduced dental formula and the short premaxilla.