Phylogenetic species concept is primarily used to define extinct species known only from the fossil record.
Although species serve a variety of special and essential functions in biology, none are more crucial than their involvement in phylogeny, naming, and biodiversity research. There is no way to divide species into smaller units where shared derived features may be accurately identified. A universally applicable species idea is necessary for biodiversity inventory, evaluation, and conservation. In formal Linnaean classification and zoological nomenclature, species are the fundamental units.
The Biological Species Concept pushed a basic taxonomic problem—what are species?—into a population genetics framework—why are there species?—and has long had only minimal support from most zoologists. Early attempts to develop a phylogenetic species concept concentrated on fixing issues with the biological species concept related to ancestral populations before applying phylogenetic reasoning to the actual species.
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