You can add to this the fact that even with the original 3 classic divisions called "race" there is great variety of skin color as well as great variety of other features. As Jonathan Marks put it:
"By the 1970s, it had become clear that (1) most human differences were cultural; (2) what was not cultural was principally polymorphic — that is to say, found in diverse groups of people at different frequencies; (3) what was not cultural or polymorphic was principally clinal — that is to say, gradually variable over geography; and (4) what was left — the component of human diversity that was not cultural, polymorphic, or clinal — was very small.
A consensus consequently developed among anthropologists and geneticists that race as the previous generation had known it — as largely discrete, geographically distinct, gene pools — did not exist."
[from Human biodiversity: genes, race, and history (1995)]
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