Miocene mammals

Hyaenodon ("hyena-tooth") is an extinct genus of carnivorous placental mammals from the tribe Hyaenodontini, part of the subfamily Hyaenodontinae (which is within the family Hyaenodontidae), that belonged to the now extinct order Hyaenodonta. The genus was found lived in Eurasia and North America from the Middle Eocene to the Early Miocene, from 38 to 17 million years ago, existing for . Hyaenodon first evolved in Asia, probably evolving from Propterodon.

Desmostylus is an extinct genus of herbivorous mammal of the family Desmostylidae living from the Chattian stage of the Late Oligocene subepoch through the Late Miocene subepoch (28.4 mya–7.250 Mya) and in existence for approximately .

Hyainailouridae ("hyena-like cats") is a paraphyletic family of extinct predatory mammals within the polyphyletic superfamily Hyainailouroidea within extinct order Hyaenodonta. Fossil records show hyainailourids arose during the Middle Eocene, although Early Eocene origin is suspected, the family persisted into the Late Miocene.'' Fossils of this group have been found in Eurasia, Africa, and North America. ==Classification and phylogeny== ===Relations=== Hyainailouridae used to be considered a subfamily of Hyaenodontidae, but cladistic study by Sole et al.'', (2013, 2015) treats it as a disti

Desmostylidae is an extinct family of herbivorous marine mammals belonging to the order of Desmostylia. They lived in the coastal waters of the northern Pacific Ocean from the Early Oligocene (Rupelian) through the Late Miocene (Tortonian) (33.9 mya—7.2 MYA), existing for approximately .

Hondalagus is an extinct genus of mammals that lived during the Middle Miocene epoch (Laventan) in South America. Their fossils were found in the Honda Group at Quebrada Honda, in southern Bolivia. Hondalagus represents the smallest and most specialized member of the extinct family Argyrolagidae.