Zwaluwen lagere taxa
sylvain Adnet; Brigitte senut; Thierry tortosa; Romain Amiot, julien Claude, sébastien Clausen, Anne-laure decombeix, vincent Fernandez, grégoire métais, Brigitte meyer-Berthaud, serge muller (25 September 2013). La taxinomie s'enrichit avec l'invenition du mot «taxon» par Adolf meyer-Abich, naturaliste allemand, dans sa logik der morphologie, im Rahmen einer Logik der gesamten biologie (1926) Translation: Taxonomy is enriched by the invention of the word "taxon" by Adolf meyer-Abich, german naturalist, in his Logik. CS1 maint: Multiple names: authors list ( link ) meyer-Abich, Adolf (1926). Logik der Morphologie im Rahmen einer Logik der gesamten biologie. Tata McGraw Hill, new Delhi,. iczn (1999) International Code of zoological Nomenclature. International Commission on zoological Nomenclature.
Rank is relative, and restricted to a koop particular systematic schema. For example, liverworts have been grouped, in various systems of classification, as a family, order, class, or division (phylum). The use of a narrow set of ranks is challenged by users of cladistics ; for example, the mere 10 ranks traditionally used between animal families (governed by the iczn ) and animal phyla (usually the highest relevant rank in taxonomic work) often cannot adequately. In addition, the class rank is quite often not an evolutionary but a phenetic or paraphyletic group and as opposed to those ranks governed by the iczn (family-level, genus-level and species -level taxa can usually not be made monophyletic by exchanging the taxa contained therein. This has given rise to phylogenetic taxonomy and the ongoing development of the PhyloCode, which has been proposed as a new alternative to replace linnean classification and govern the application of names to clades. Many cladists do not see any need to depart from traditional nomenclature as governed by the iczn, icn, etc. See also edit this is not considered as mandatory, however, as indicated by terms for non- monophyletic groupings invertebrates "conifers "fish etc). References edit quammen, david (June 2007). "a passion for Order". Retrieved e queiroz, k j gauthier (1990). "Phylogeny as a central Principle in Taxonomy: Phylogenetic Definitions of Taxon Names" (PDF).
related and which have characters in common which differentiate (q.v.) the unit (e.g. A geographic population, a genus, a family, an order) from other such units. A taxon encompasses all included taxa of lower rank (q.v.) and individual organisms." A taxon can be assigned a taxonomic rank, usually (but not necessarily) when it is given a formal name. "Phylum" applies formally to any biological domain, but traditionally it was always used for animals, whereas "division" was traditionally often used for plants, fungi, etc. A prefix is used to indicate a ranking of lesser importance. The prefix super- indicates a rank above, the prefix sub- indicates a rank below. In zoology the prefix infra- indicates a rank below sub. For instance, among the additional ranks of class are superclass, subclass and infraclass.
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Since then, systematists have striven to construct an accurate classification encompassing the diversity of life; today, a "good" or "useful" taxon is commonly taken to be one that reflects evolutionary relationships. N 1, many modern systematists, such as advocates of phylogenetic nomenclature, use cladistic methods that require taxa to be monophyletic (all descendants of some ancestor). Their basic unit, therefore, is the clade rather than the taxon. Similarly, among those contemporary taxonomists working with the traditional Linnean (binomial) nomenclature, few propose taxa they know to be paraphyletic. 2 An example of a well-established taxon that is not also a clade is the class Reptilia, the reptiles; birds are descendants of reptiles but are not included in the reptilia. Contents History edit The term taxon was first used in 1926 by Adolf meyer-Abich for animal groups, as a backformation from the word Taxonomy ; the word Taxonomy had been coined a century before from the Greek components τάξις ( taxis, meaning arrangement) and -νομία. 3 4 For plants, it was proposed by herman Johannes Lam in 1948, and it was adopted at the vii international Botanical Congress, held in 1950.
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For the journal, see, taxon (journal). For other uses, see, taxa (disambiguation). In biology, a taxon (plural taxa ; back-formation from taxonomy ) is a group of one or more populations of an organism or organisms seen by premier taxonomists to form a unit. Although neither is required, a taxon is usually known by a particular name and given a particular ranking, especially if and when it is accepted or becomes established. It is not uncommon, however, for taxonomists to remain at odds over what belongs to a taxon and the criteria used for inclusion. If a taxon is given a formal scientific name, its use is then governed by one of the nomenclature codes specifying which scientific name is correct for a particular grouping. Linnaeus 's system in, systema naturae (10th edition, 1758) 1 and unpublished work by, bernard and. Antoine laurent de jussieu, the notion of a unit-based "natural system" of biological classification was first made widely available in 1805 through the publication, as the introduction to the third edition. Jean-Baptiste lamarck 's, flore françoise, of, augustin Pyramus de candolle 's, principes élémentaires de botanique, an exposition of a system for the "natural classification" of plants.