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Life Domain Kingdom Phylum Class Order Family Genus Species

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The hierarchy of biological classification's eight major taxonomic ranks. Intermediate minor rankings are not shown.

In biological classification, class (Latin: classis) is

  • a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, order, family, genus, and species, with class fitting between phylum and order. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the prefix sub-: subclass (Latin: subclassis).
  • a taxonomic unit, a taxon, in that rank. In that case the plural is classes (Latin classes)

The composition of each class is determined by a taxonomist. Often there is no exact agreement, with different taxonomists taking different positions. There are no hard rules that a taxonomist needs to follow in describing a class, but for well-known animals there is likely to be consensus. For example, dogs are usually assigned to the phylum Chordata (animals with notochords); in the class Mammalia; in the order Carnivora (mammals that eat meat).

History of the concept

The class as a distinct rank of biological classification having its own distinctive name (and not just called a top-level genus (genus summum) was first introduced by a French botanist Joseph Pitton de Tournefort in his classification of plants (appeared in his 1694 Eléments de botanique). Carolus Linnaeus was the first to use it consistently, in dividing of all three of his kingdoms of Nature (minerals, plants, and animals) in his Systema Naturae (1735, 1st. Ed.).[1] Since then class had been considered the highest level of the taxonomic hierarchy until the embranchements, now called phyla, and divisions were introduced in the nineteenth century.

References

  1. ^ Mayr E. (1982). The Growth of Biological Thought. Cambridge: The Belknap Press of Harvard University Press. ISBN 0-674-36446-5

See also

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Simple English

A class is a rank used in the biological taxonomy of all organisms. Each class is split into orders. There are multiple classes in each phylum. Class is Came in the mnemonic, or a saying to help a person remember something, King Phillip Came Over For Great Spaghetti.


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