The first tapirids, such as Heptodon, appeared in the early Eocene.
They appeared very similar to modern forms, but were about half the size, and lack the proboscis.
The first true tapirs, appeared in the Oligocene, and by the Miocene, such genera as Miotapirus were almost indistinguishable to the extant species.
It is believed that Asian and American tapirs diverged around 20 to 30 million years ago, and that tapirs migrated from North America and Central America into South America around 3 million years ago, as part of the Great American Interchange.
For much of their history, tapirs were spread across the northern hemisphere, where they became extinct as recently as 10,000 years ago.

It is also believed by some scientists that the tapir may have evolved from Hyracotherium (a palaeothere).
The first tapirids, such as Heptodon, appeared in the early Eocene. They appeared very similar to modern forms, but were about half the size, and lack the proboscis. The first true tapirs, appeared in the Oligocene, and by the Miocene, such genera as Miotapirus were almost indistinguishable to the extant species. It is believed that Asian and American tapirs diverged around 20 to 30 million years ago, and that tapirs migrated from North America and Central America into South America around 3 million years ago, as part of the Great American Interchange. For much of their history, tapirs were spread across the northern hemisphere, where they became extinct as recently as 10,000 years ago.
It is also believed by some scientists that the tapir may have evolved from Hyracotherium (a palaeothere).
Tapiroidea