Hyotheridium Temporal range: Santonian–Campanian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Genus:	†Hyotheridium Gregory & Simpson, 1926
Species:	†H. dobsoni
Binomial name
†Hyotheridium dobsoni Gregory & Simpson, 1926

Hyotheridium is a possible Eutherian from the Late Cretaceous (?late Santonian–early Campanian) Djadochta Formation of Mongolia. It also could be a Deltatheriid, although the fossil, a poorly preserved skull with the upper and lower jaws connected in a way that makes them hard to separate and to examine, makes it difficult to determine what it is.^[1]