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The two-empire system is the top-level biologicial classification system in general use before the establishment of the three-domain system. Some biologists prefer the two-empire system over the three-domain system, in that the three-domain system overemphasizes the division between Archea and Bacteria. The two-empire system was eventually succeeded by the current six / five-kingdom system.
| Two empires | Three domains | Six kingdoms | ||
|---|---|---|---|---|
| Mineralia non-life | ||||
| Biota / Vitae life | ||||
| Acytota / Aphanobionta (Viruses, Viroids, Prions?, ...) non-cellular life | ||||
| Cytota cellular life | ||||
| Prokaryota / Procarya (Monera) | Eubacteria | Bacteria | ||
| Archaea | Archaebacteria | |||
| Eukaryota / Eucarya | Eukaryota | Protista | ||
| Fungi | ||||
| Plantae | ||||
| Animalia | ||||
See also
"Two-empire system"