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Furthermore, this isn’t the end of it, since they noted that their study was not a revision of the entire species complex but merely an initial demonstration of ‘P. plica’s’ polytypic status.

Put together, Mayr said, these various practical and theoretical considerations dictated that every one of the human fossils known should be placed within a single evolving polytypic lineage.

Two Recent species, each polytypic with eight subspecies, and five fossil species are recognized.

In nearly all the other forms of isolation, polytypic or divergent evolution may arise under the influence of that form alone, or without the necessary co-operation of any other form.

Or, in other words, natural selection, when acting alone, can never induce polytypic evolution, but only monotypic.