Breeds, not species
Previous item mentioned the Neanderthal tribe.
Here's a new DNA finding about the Denisovan tribe.
Neanderthals seem to have become most of Europe, especially around modern France and Germany. Denisovans seem to have become part of Polynesia, in the Phillipines and New Guinea.
Viewing these groups as tribes or breeds is more logical and 'orthogonal' than the standard Darwinian species division.
Breeds happen as a result of selective breeding. They're not stages on a timeline.
Thinking in dog terms removes some of the overlay. Denisovans are Labradors. Nice, loyal, always aiming toward friendship. Neanderthals are German (of course) Shepherds. Strict, organized, hierarchical.
Other major groups would be Oriental, Middle East, Siberian/American, African. These would have been forming in the same era as the Denisovans and Neanderthals from an earlier 'wolf' stock.
Dog breeds were formed by the EXTERNAL influence of human culture. Human breeds were formed by the INTERNAL influence of human culture.
In this view, each of the groups was formed BY CULTURE, through assortative and selective mating.