Arboroharamiya

Arboroharamiya is an extinct genus of mammaliaform from the Late Jurassic Tiaojishan Formation of Inner Mongolia, China. Arboroharamiya belongs to a group of mammaliaforms called Haramiyida. The genus contains three species: A. jenkinsi (the type species), A. allinhopsoni and A. fuscus. Based on the melanosomes preserved in its fur, Arboroharamiya likely had a uniformly dark-brown coloration, similar to that of other early mammaliaforms including Vilevolodon and Megaconus.

When Arboroharamiya was included in a phylogenetic analysis of early mammals and mammaliaforms, Haramiyida was found to be a group within Mammalia, the true mammals. However, in a different analysis which included Megaconus, Haramiyida was placed outside Mammalia as a more basal ("primitive") group of mammaliaforms. The classification of Arboroharamiya and other haramiyidans as true mammals fits with what most previous studies have found, but since Arboroharamiya and Megaconus were not included in the same phylogenetic analysis, their position within Mammaliaformes remains uncertain.