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Phylogenetic tree

A phylogenetic tree based on rRNA data, showing the separation of bacteria, archaea, and eukaryotes.

In biology, domain (also superregnum, superkingdom, or empire) is the top-level taxon of organisms in scientific classification, higher than a kingdom. Domain (or its synonyms) is the most inclusive of these biological groupings. The names are arbitrary, but the arrangement reflects the fundamental evolutionary differences in the genomes. There are several modern alternative domain classifications of life. Among them are:

and the most recent,

As these groupings depend primarily on the analysis of genetic sequence data, additional proposed arrangements are to be expected.

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