Catopsbaatar
Catopsbaatar is a genus of multituberculate, an extinct order of rodent-like mammals. It lived in what is now Mongolia during the late Campanian age of the Late Cretaceous Period, about 72 million years ago. The first fossils were collected in the early 1970s, and the animal was named as a new species of the genus "Djadochtatherium " in 1974, "D. catopsaloides". The specific name refers to the animal's similarity to the genus "Catopsalis". The species was moved to the genus "Catopsalis" in 1979, and received its own genus ("Catopsbaatar", Greek and Mongolian for "visible hero") in 1994. Five skulls, one molar, and one skeleton with a skull are known; the latter is the genus' most complete specimen. "Catopsbaatar" was a member of the family Djadochtatheriidae.
Catopsbaatar
All specimens of "Catopsbaatar" are known from the Red Beds of Hermiin Tsav formation, except for one molar from the Barun Goyot Formation. The formations are considered coeval (of the same geological age), contain many of the same animals, and probably date to the late Campanian age of the Late Cretaceous Period (about 72 million years ago). The rock facies of the Red Beds of Hermiin Tsav formation consist of orange-coloured, thick-bedded sandstone, with a thin interbedding of light-coloured silt stones and claystones. The rock facies of the Barun Goyot Formation are considered to be the result of an arid or semi-arid environment, with aeolian (deposited by wind) beds.