[Doctor Stochastic]

It's also interesting to note that all the "old world" (OW) and "new world" (NW) army ants are separate branches of the oldest split of the army ant family tree.

This is also an indication of continental drift (or less likely, ant drift.) Tree trees show the same split. It's possible that a group of proto-ants were carried (perhaps by an African proto-sparrow) from one contenent to another and their descendents drifted genetically from the mother nest, but not so likely with both ants and trees.

[steve-b]

It's possible that a group of proto-ants were carried (perhaps by an African proto-sparrow)

What is the airspeed of an African proto-sparrow laden with army ants?