Division (biology)

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This article discusses categorisations of organisms. For a different meaning in biology, see cell division.
The hierarchy of scientific classification

Division is a taxonomic rank.

In biology, the equivalent of a phylum in the plant or the fungal kingdom is called a division.

The main plant divisions, in the order in which they probably evolved, are the liverworts (Division Marchantiophyta), the hornworts (Division Anthocerophyta), the mosses (Division Bryophyta), the ferns (Division Filicophyta), the horsetails (Division Sphenophyta), the cycads (Division Cycadophyta), the ginkgo (Division Ginkgophyta), the conifers (Division Pinophyta), the gnetophytes (Division Gnetophyta), and the angiosperms (Division Magnoliophyta). Angiosperms are the flowering plants that now dominate the plant world (80% of all vascular plants are angiosperms).

In zoology, the term division is applied to an optional rank subordinate to the infraclass and superordinate to the cohort. A widely used classification (e.g. Carroll 1988) recognises teleost fishes as a Division Teleostei within Class Actinopterygii (the ray-finned fishes). Less commonly (as in Milner 1988), living tetrapods are ranked as Divisions Amphibia and Amniota within the clade of vertebrates with fleshy limbs (Sarcopterygii).

  • Carroll, Robert L. 1988. Vertebrate Paleontology and Evolution. New York: W.H. Freeman & Co. ISBN 0-716-7-1822-7.
  • Milner, Andrew. 1988. "The relationships and origin of living amphibians." In M.J. Benton (ed.), The Phylogeny and Classification of the Tetrapods, Volume 1: Amphibians, Reptiles, Birds, pp. 59-102. Oxford: Clarendon Press.
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Taxonomic ranks
Domain or Magnorder
Superkingdom Superphylum/Superdivision Superclass Superorder Superfamily Superspecies
Kingdom Phylum/Division Class Order Family Tribe Genus Species
Subkingdom Subphylum Subclass Cohort Suborder Subfamily Subtribe Subgenus Subspecies
Branch Infraphylum Infraclass Legion Infraorder Alliance Infraspecies
Microphylum Parvclass Parvorder


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