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Biological species concepts through the mid-twentieth century usually included one or more criteria of speciation mechanism. 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. However, applying a biological species concept would reveal potential sympatric sibling species, namely transient killer whales and resident killer whales. |
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