Monera

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Definition

Noun 1. A taxonomic kingdom comprising prokaryotic organisms: In some biological classification systems, 'Monera' is the kingdom that includes all prokaryotes—organisms whose cells lack a distinct nucleus and other membrane-bound organelles. This traditionally encompassed bacteria and cyanobacteria (blue-green algae).

Usage Notes
  • Historical/Legacy Term: The term 'Monera' is primarily used in historical or specific educational contexts. Modern taxonomy, based on genetic analysis, no longer recognizes Monera as a single kingdom. Prokaryotes are now classified into two distinct domains: Bacteria and Archaea.
  • Informal Grouping: As noted in the reference, due to changing scientific consensus, 'Monera' and similar terms are often used as informal names for major divisions of life rather than formal taxonomic ranks.
Examples
  • In older biology textbooks, life was often divided into five kingdoms: Animalia, Plantae, Fungi, Protista, and Monera.
  • The kingdom Monera includes diverse organisms, from beneficial soil bacteria to pathogenic species.
Advanced Usage
  • Moneran (adjective): Relating to or characteristic of the kingdom Monera.
    • Example: The moneran cell structure is fundamentally different from that of plants and animals.
Variants and Related Words
  • Prokaryote (noun): The modern, more precise term for any organism belonging to the domains Bacteria or Archaea, characterized by the absence of a cell nucleus. This is the term favored in current scientific literature.
  • Bacteria (noun): A major domain of prokaryotic microorganisms, many of which are studied within the former kingdom Monera.
  • Cyanobacteria (noun): A phylum of bacteria that obtain energy via photosynthesis; formerly known as blue-green algae and classified under Monera.
Synonyms
  • Prokaryotes (in the historical context)
  • Bacterium (in a broad, non-technical sense)
Related Concepts
  • Eukaryote: An organism whose cells contain a nucleus and other organelles enclosed within membranes. This is the fundamental contrast to organisms once grouped under Monera.
  • Taxonomy: The science of classification. The changing status of 'Monera' exemplifies how taxonomic systems evolve with new scientific discoveries.
Noun
  1. prokaryotic bacteria and blue-green algae and various primitive pathogens; because of lack of consensus on how to divide the organisms into phyla informal names are used for the major divisions

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