USA NPN National Phenology Network

Taking the Pulse of Our Planet

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(From the Glossary of the International Code of Zoological Nomenclature:) "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 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 and individual organisms. [...]"

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