Apatemyidae Temporal range: Paleocene–Oligocene PreꞒ Ꞓ O S D C P T J K Pg N
Heterohyus nanus
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Superorder:	Euarchontoglires (?)
Order:	†Apatotheria Scott & Jepsen, 1936
Family:	†Apatemyidae Matthew, 1909
Genera[2]
†Aethomylos †Apatemys †Asiapator[1] †Carcinella †Frugivastodon †Heterohyus †Jepsenella †Labidolemur †Sinclairella †Unuchinia

Apatemyidae is an extinct family of placental mammals that took part in the first placental evolutionary radiation together with other early mammals such as the leptictids. Their relationships to other mammal groups are controversial; a 2010 study found them to be basal members of Euarchontoglires.^[3]

Common in North America during the Paleocene, they are also represented in Europe by the genus Jepsenella.^[4]

Apatemyids in life

Like most Paleocene mammals, the apatemyds were small and presumably insectivorous. Size ranged from that of a dormouse to a large rat. The toes were slender and well clawed, and the family were probably mainly arboreal.^[5] The skull was fairly massive compared to the otherwise slender skeleton, and the front teeth were long and hooked, resembling those of the modern aye-aye, both whom make their living by gnawing off bark with their front teeth to get at grubs and maggots beneath.^[6]