https://multituberculateearth.wordp.....cia-formation/
https://sites.google.com/view/allot.....ucia-formation

As equally perplexing as it is elegant, Fo gaxie is undeniably a meridiolestidan, but it is unclear if it is a leonardid or if it belongs to the poorly understood clade Brandoniidae (whose very existence is somewhat controversial in the first place, with alleged dental remains often considered synonims for leonardid or mesungulatid taxa). If a brandoniid, it fits the expected ecological niche this group occupied as a fast-running insectivore/omnivore since their teeth are noted as similar to those of sengi, being one of the only two cursorial mammals known from this formation alongside Fusuamys. Phylogenetic studies seem to place it as a leonardid closely related to allochiropterids; if this is true for all brandoniids remains to be seen. At any rate, Fo gaxie is one of the rarest of Santa Lucia's mammals, known only from two semi-complete specimens and a lower jaw, owing perhaps to its delicate frame and perhaps solitary habits like those of our sengi.