The heirachy of biological classification's eight major taxonomic ranks. Intermediate minor rankings are not shown.

In biological taxonomy, a domain (also superregnum, superkingdom, or empire) is the highest taxonomic rank of organisms, higher than a kingdom. According to the three-domain system of Carl Woese, introduced in 1990, the Tree of Life consists of three domains: Archaea, Bacteria and Eukarya.[1] The arrangement of taxa reflects the fundamental differences in the genomes.


  1. Savela, M. (2005). Acrobasis genus. Retrieved 2009-03-12.
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