= Phylogenetic species concept
<Phylogenetic species concepts> use ancestry and diagnostic inherited differences; versions differ over requiring a <clade>, an exclusive ancestry pattern at <genetic loci>, or a distinguishable character combination. State which criterion is intended. <Species Concepts and Species Delimitation by Kevin de Queiroz>[p. 880, Table 1: distinct monophyletic, genealogical and diagnosable versions of phylogenetic criteria]{ref}
For an original operational example, suppose a <phylogenetic tree> inferred from one <genetic locus> separates two sampled <biological populations>. Compare further <genetic loci> and additional local samples before interpreting that branch as a <species> boundary. Otherwise the test may merely identify the particular ancestry of the sampled <alleles>. Adding more sites from the same <genetic locus> improves that locus's evidence without creating an independent ancestry test.
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