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[[Image:Ficheiro.png|thumb|100px|The hierarchy of taxonomic classification]]
[[Image:Ficheiro.png|thumb|100px|The hierarchy of taxonomic classification]]
A '''taxon''' or '''taxonomic unit''' is a group of individuals that are grouped together based on similarities between the individuals. This is an hierarchical system in which lower taxonomic units are groups in higher taxonomic units. The only natural unit is the [[species]].


The figure at the right illustrates the hierarchy of the various levels. Three domains — [[Archaea]], [[Bacteria]], and [[Eukarya]] — incorporate all known [[Life|living systems]].
Biologists group [[Organism|organisms]] into a hierarchical system of '''taxons''' or '''taxonomic units''', each taxon based on specified criteria of similarity or relationship.
 
The figure at the right illustrates the hierarchy of taxons. The highest taxon, the 'domain', of which biologists have identified three — [[Archaea]], [[Bacteria]], and [[Eukarya]] — together include all known [[Life|living systems]].

Revision as of 19:56, 5 May 2009

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The hierarchy of taxonomic classification

Biologists group organisms into a hierarchical system of taxons or taxonomic units, each taxon based on specified criteria of similarity or relationship.

The figure at the right illustrates the hierarchy of taxons. The highest taxon, the 'domain', of which biologists have identified three — Archaea, Bacteria, and Eukarya — together include all known living systems.