You know what it looks like… but what is it called?
TAKE THE QUIZRassenkreis
noun
Ras·sen·kreis
ˈräsᵊnˌkrīs
plural Rassenkreise
-īzə
: a polytypic species especially when exhibiting a pattern of geographical replacement of one type by another
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Merriam-Webster unabridged
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