Artenkreis
noun
Ar·ten·kreis
ˈärtᵊnˌkrīs
plural Artenkreise
-īzə
or Artenkreises
-īsə̇z
: a group of species that replace one another in geographic sequence, presumably trace ultimately to a common ancestral form, and are equivalent as a group to a subgenus
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Merriam-Webster unabridged
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