Planetetherium

Planetetherium is an extinct genus of herbivorous gliding mammal endemic to North America during the Paleogene living from 56.8 to 55.4 mya, existing for approximately.
Fossils have been discovered in strata formed from ancient cypress forests, suggesting that this was the animal's preferred habitat.

Morphology

Plantetherium is estimated to reach around in length, and its known materials closely resembled that of its modern relatives. Its teeth already included the comb-like structure distinctive to modern colugos. Since no postcranial materials have been described for any plagiomenid, there is no direct evidence that Planetetherium had the membrane of skin that allows modern colugos to glide, but this was likely the case.