However, based on Haramiyavia, the jaw is less derived; and at the level of evolution of earlier basal mammals like Morganucodon and Kuehneotherium, with a groove for ear ossicles on the dentary.

[7] †Thomasia †Haramiyavia †Megaconus †Tritylodontidae †Morganucodonta †Docodonta Monotremata †Eutriconodonta Cladotheria (including Theria) †Multituberculata †Euharamiyida †Cifelliodon †Gondwanatheria Simplified cladogram from Mao et al. 2024, showing a paraphyletic Haramiyida closely related to Multituberculata outside of crown Mammalia:[16]†Tritylodontidae †Sinoconodon †Morganucodonta †Docodonta+Shuotheriidae †Hadrocodium †Haramiyavia †Thomasia †Euharamiyida †Multituberculata (including Gondwanatheria) Australosphenida (including Monotremata) †Eutriconodonta (partim) †Gobiconodontidae †Spalacotheriidae and other "symmetrodonts" †Dryolestida Theria Haramiyids seem to have generally been herbivorous or omnivorous, possibly the first mammalian herbivores; however, the sole haramiyid tested in a study involving Mesozoic mammal dietary habits, Haramiyavia, ranks among insectivorous species.

[19] Several euharamiyidans, Maiopatagium, Xianshou, Vilevolodon and Arboroharamiya, took it one step further and developed the ability to glide, having extensive membranes similar to those of modern colugos.

In many of these taxa, the coracoid bones (absent in modern therians but present in many other mammal groups, albeit highly reduced) are remarkably large and similar to those of birds and pterosaurs, presumably due to impact stresses at landing.

[7] The youngest haramiyid fossil genus has been considered to be possibly be Avashishta bacharamensis from the Maastrichtian of India,[24] however, this has not been robustly assessed by phylogenetics.