species

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Nomenclature, variation, and the biological species concept in Lamasina (Lycaenidae: Theclinae: Eumaeini).
75) The biological species concept, which defines a species as a naturally interbreeding group of organisms, faces the blurred boundary of hybridization and asexual reproduction.
They are known by numerous terms: the morphological species concept, biological species concept, evolutionary species concept, recognition species concept, cohesion species concept, phylogenetic species concept, Greek species concept, tyological species concept, Darwin's species concept, ecological species concept, phenetic species concept, etc.