Astrapotherium

Astrapotherium ("lightning beast") is an extinct genus of South American mammals that vaguely resembled a small elephant or large tapir. However, it was unrelated to elephants or tapirs, but was instead related to other extinct South American ungulates. Fossils have been dated from the Early to Middle Miocene. Fossil remains of the type species "A. magnus" have been found in the Santa Cruz Formation in Argentina. Other fossils have been found in the Deseado, Sarmiento, and Aisol Formations of Argentina and Chile (Cura-Mallín Group).
Description.
"Astrapotherium" had an elongated body, with a total length around , a weight of nearly , and relatively short limbs. It had small plantigrade feet, and the hind limbs were significantly weaker than the fore limbs. Its four canine teeth were elongated to form short tusks, and it had broad, protruding lower incisors, which likely ground against a horny pad in the upper jaw, as in many modern ruminants.
The nostrils were placed high on the head, which might indicate the presence of a trunk, but could equally be due to other reasons, such as an inflatable nasal cavity.
Classification.
Cladogram based in the phylogenetic analysis published by Vallejo-Pareja "et al"., 2015, showing the position of "Astrapotherium":
Paleobiology.
The animal was probably at least partially aquatic, living in shallow water and feeding on marsh plants in a similar manner to a modern hippopotamus.