Phylogenetic Systematics and species concept
Abstract
There actually is no species problem per se in systematics. Rather, there is a taxon problem. This review argues that a decision must first be made about what entities taxon names are to represent in general. Then, species taxa should be the same kind of things, but just the least inclusive taxa that are named using the formal Linnaean nomenclatorial system. Formal classifications are meant to serve purposes of communication, data storage, predictivity, and function in theories. These purposes are best served by naming only phylogenetically natural, monophyletic groups. These are groups containing all and only descendants of a common ancestor. A phylogenetic species concept can thus be defined, based on a generalized view of the meaning of monophyly and synapomorphy. In the process of building a classification , taxonomic groups are recognized on the basis of clear support for their existence as monophyletic cross-sections of a lineage. Also, formal taxa are named considering their utility in developing and discussing evolutionary process theories.Downloads
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