Definition
The Glossary of the International Code of Zoological Nomenclature (1999) defines a
- "taxon, (pl. taxa), n.
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- A taxonomic unit, whether named or not: i.e. a population, or group of populations of organisms which are usually inferred to be phylogenetically related and which have characters in common which differentiate (q.v.) the unit (e.g. a geographic population, a genus, a family, an order) from other such units. A taxon encompasses all included taxa of lower rank (q.v.) and individual organisms. "
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