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Monera (/məˈnɪərə/ mə-NEER-ə) is a now-obsolete taxonomic group in biological classification originally understood as one of five biological kingdoms. The kingdom Monera included most organisms with a prokaryotic cell organization (that is, no nucleus). For this reason, the kingdom was sometimes called Prokaryota or Prokaryotae

Under the three-domain system of taxonomy established in 1991, the organisms formerly within Monera have been divided into two domains, Archaea and Bacteria (with Eukaryote as the third domain).