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In biology , a kingdom or regnum is the top-level, or nearly the top-level, taxon of organisms in scientific classification. Originally two kingdoms were distinguished: the Animalia for animals, and the Vegetabilia or Plantae for plants. Early authors also treated minerals in a third kingdom Mineralia.
Each kingdom was divided into classes, later grouped into phyla for animals and divisions for plants. More recently, various other kingdoms have been created, and the ideal number and delineations are not settled. When single-celled organisms were first discovered, they were split between the two kingdoms: mobile forms in the animal phylum Protozoa , and colored algae and bacteria in the plant division Thallophyta or Protophyta.
However, a number of forms were placed in both - for instance the mobile alga Euglena , and the amoeba-like slime moulds. As a result, Ernst Haeckel suggested creating a third kingdom Protista for them, although this was not very popular until relatively recently sometimes as the Protoctista. The discovery that bacteria have a radically different cell structure from other organisms prokaryotic rather than eukaryotic led Herbert Copeland to give them a separate kingdom, originally called Mychota but later referred to as Monera or Bacteria.
As it became apparent how important this distinction is, it became popular to divide living things into two superkingdoms or empires, called Prokaryota and Eukaryota.
Whittaker recognized an additional kingdom for the Fungi. The resulting five-kingdom system, proposed in , has became a popular standard and with some refinement is still used in many works, or forms the basis for newer multi-kingdom systems. It is based mainly on differences in nutrition: his Plantae were mostly multicellular autotrophs , his Animalia multicellular heterotrophs , and his Fungi multicellular saprotrophs.
The remaining two kingdoms, Protista and Monera, included unicellular and simple cellular colonies. In the years around there was an emphasis on phylogeny and redefining the kingdoms to be monophyletic. The Animalia, Plantae, and Fungi were generally reduced to core groups of closely related forms, and the others thrown into the Protista. Such six-kingdom systems have become standard in many works.
A variety of new eukaryotic kingdoms were also proposed, but most were quickly invalidated, ranked down to phyla or classes, or abandoned. The only one which is still in common use is the kingdom Chromista proposed by Cavalier-Smith , including organisms such as kelp , diatoms , and water moulds.
Thus the eukaryotes are divided into three primarily heterotrophic groups, the Animalia, Fungi, and Protozoa, and two primarily photosynthetic groups, the Plantae including red algae and Chromista. However, it has not become widely used because of uncertainty over the monophyly of the latter two kingdoms.
In , Woese proposed that the Eubacteria, Archaebacteria, and Eukaryota represent three primary lines of descent and accordingly he promoted them to domains, renaming them Bacteria, Archaea, and Eucarya. This three-domain system has received notable criticism but has generally displaced the older two-empire system as a way of organizing kingdoms together. See also: Binomial nomenclature , Scientific classification , Taxonomy.
Categories : Scientific classification. Kingdom biology From Academic Kids. Toolbox Special pages. This page was last modified , 19 Jun This page has been accessed times. About Academic Kids Disclaimers.
The Five Kingdoms
By : Ani Ramli A. Bacteria is clas- sified in two, they are : a. Archaebacteria b. Eubacteria Beberapa ahli biologi mengklasifikasikan bakteri ke dalam Kerajaan Bakteri sementara yang lain mengklasifikasikan ke dalam kerajaan monera. Bakteri adalah Clas sified dua, yaitu: Archaebacteria Eubacteria According to its extreme surrounding,Archae bacteria is divided into three groups,that is : 1. Methanogen BacteriaThe bacteria produce methane from hydrogen and CO2 gas or acetate acid.
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Toggle navigation. All living things are classified into kingdoms. Living organisms are classified based on similarities within their DNA, structure, reproduction, and appearance. Having this kind of grouping system allows scientists to study one or more of the 1. This also allows scientists to discover one or more of the millions of species that have yet to be discovered. Currently there are five widely accepted kingdoms of which all living things are classified: monera, protists, fungi, plants, and animals. All organisms within each kingdom share characteristics that are unique to that particular group.