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Smallest Distinct Groupings
Definition: A general criterion for the species category shared to some degree by all formal species concepts is that species be the least inclusive population or lineage of populations having a unique history of common descent. Violation of this criterion would blur the distinction between species and higher taxa.
Source: Hickman, C.P., et al. 2011. Integrated Principles of Zoology. Fifteenth Edition. McGraw-Hill Higher Education.