Asiatherium

Asiatherium is an extinct genus of mammal, probably belonging to Metatheria. It lived during the Late Cretaceous, and its fossilized remains were discovered in Mongolia.

Asiatherium Temporal range: Late Cretaceous (Campanian) 83.6 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Holotype of Asiatherium
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	†Asiadelphia
Family:	†Asiatheriidae
Genus:	†Asiatherium Trofimov & Szalay, 1994
Species:	†A. reshetovi
Binomial name
†Asiatherium reshetovi Trofimov & Szalay, 1994

Description

Skull of Asiatherium is 30 mm (1.2 in) in length.^[1] This animal was roughly the size of a mouse, and is known from a fairly complete articulated skeleton, preserving a complete skull. Its teeth resembled roughly those of marsupials; it possessed three premolars and four molars, and the mandible was slightly curved. Compared to Deltatheridium, Asiatherium was even more marsupial-like, due to its molars having paraconids lower than the metaconids, and the paired entoconid-hypoconulid cusps on the lower molars. The stylar platform of the upper molars was however narrower and the stylar cusps weaker than in primitive marsupials. The upper molars differed from those of marsupials in their expanded praecingula and postcingula.^[2]

Classification

Asiatherium reshetovi was first described in 1994, based on fossils found in the Udan-Sayr locality of the Djadokhta Formation, in Mongolia. Asiatherium seems to be related to early marsupials, but probably was nested within a different clade of Metatherian, Deltatheroida, nested alongside Deltatheridium. The skeleton of Asiatherium looked like that of a basal Therian; epipubic bones, typical of marsupials, were present.