Three-domain system
Hypothesis for classification of life
Three-domain system
The three-domain system is a taxonomic classification system that groups all cellular life into three domains, namely Archaea, Bacteria and Eukarya, introduced by Carl Woese, Otto Kandler and Mark Wheelis in 1990. The key difference from earlier classifications such as the two-empire system and the five-kingdom classification is the splitting of Archaea (previously named "archaebacteria") from Bacteria as completely different organisms. The three-domain system has been contested by scientists who believe that eukaryotes do not form a separate domain of life, but instead represent a clade alongside the Archaea, in a single shared domain. A consensus has emerged that eukaryotes evolved from an archaeal host with affinities to living Asgard archaea, in combination with an endosymbiont belonging to Alphaproteobacteria, rather than eukaryotes being separate sister grouping to Archaea.
Read on Wikipedia · Image Chiswick Chap, CC BY-SA 4.0
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