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

One of the two ferugliotheriid species, Funzaiomys (a pun on Chibcha funzaiomy, "black potato", with Greek mys, "mouse") is the smallest of the Santa Lucia herbivores, ranging from hamster to guinea pig size. It is represented by three species, F. tribbitherium (hamster size), F. gilberti (guinea pig size) and F. troti (somewhere in between, and by far the most common though these are fairly rare finds overall). All are fairly rare finds, likely due to not only their small size but also fossorial habits. Like most ferugliotheriids it had brachydont molars instead of the hypsodont molars found in more derived gondwanatheres, so it likely fed primarily on soft plant matter like ferns, though a fairly large plagiaulacoid and robust jaws suggest it might have been more of a seed and tuber specialist. Phylogenetic studies place it in a clade with northern ferugliotheriids; whereas it descended from an endemic clade that would go on to populate the northern hemisphere in the Cretaceous/Paleocene or if it is a northern form that returned south is anyone's guess, though its durophagous speciations seem to point to the former, since it likely represents yet another local forced to speciate in the light of more competition.