In
biological taxonomy, a kingdom or regnum is a
taxon in either (historically) the highest rank, or (in the new
three-domain system) the
rank below
domain. Each kingdom is divided into smaller groups called
phyla (or in some contexts these are called "divisions"). Currently, textbooks from the United States use a system of six kingdoms (
Animalia,
Plantae,
Fungi,
Protoctista,
Archaea, and
Monera), while British and Australian textbooks describe five kingdoms (
Animalia,
Plantae,
Fungi,
Protista, Bacteria).
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