The Giant Isopod (related to the common pill bug) exemplifies this.

A giant isopod is any of the almost 20 species of large isopods (crustaceans related to the shrimp and crabs) in the genus Bathynomus.

Bathynomus giganteus, the species upon which the generitype is based, is often considered the largest isopod in the world, though other comparably poorly known species of Bathynomus may reach a similar size (e.g., B. kensleyi).

From the fossil record it is thought that Bathynomus existed more than 160 million years ago, before the break-up of the supercontinent Pangaea, so it did not evolve independently in all three locations, but since then it would be expected that Bathynomus would show divergent evolution in the various locations.