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(pl. taxa), in biology, a term used to denote any group or rank in the classificationclassification,
in biology, the systematic categorization of organisms into a coherent scheme. The original purpose of biological classification, or systematics, was to organize the vast number of known plants and animals into categories that could be named, remembered, and
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 of organisms, e.g., class, order, family.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a group of discrete objects related by more or less common properties and characteristics, thereby serving as a basis for assigning the objects to a particular taxonomic category. The identification of a taxon may be based on various properties and characteristics of objects, such as common origin, structure, composition, shape, or function, but the set of properties and characteristics in each case must be necessary and sufficient for the given taxon to occupy a unique place in a system and not intersect other taxa.

In dealing with problems of systematics and taxonomy, it is sometimes important to make a clear distinction between the terms “taxon” and “taxonomic category.” A taxon always characterizes a specific set of objects, such as objects in the organic world, units of geographic description, or linguistic units. A taxonomic category reflects only the designation and logical conditions for distinguishing the given level of the hierarchy or organizational ranking of a system. Thus, in biology, where these categories are used most often, the concepts of species, genus, and family belong to the class of taxonomic categories, whereas the Scotch pine and rodents, for example, form taxa.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


A taxonomic group or entity.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Depuracion y validacion de datos: La base de datos de cada taxon, se valido taxonomicamente, corrigiendo errores de omision, tipografia, contexto, redundancia, convencion y congruencia.
Cuadro 2: Estado, coordenadas y altitud (msnm), forma de vida, tipo de vegetacion, tipo de foliolo, complejo estomatico y numeros de colecta de cada taxon de Mimosa L.
The R package "vegan" (Oksanen et al., 2015) was used to perform CCA on average proportion of taxa per station, estimated average individual weights for each taxon per station, and 6 explanatory variables for the 2 types of WEA sampling: beam trawl only and bottom trawl only.
For each of the five geographical regions, this study considered regional means of six benthic community characteristics: biomass (g [m.sup.-2]), density (individuals [m.sup.-2]), taxon richness (number of taxa [station.sup.-1]), taxon richness density (number of taxa 1000 [m.sup.-2]), Shannon-Wiener diversity (H', using [log.sub.e]), and Pielou evenness (J').
This taxon differs from Hylaeochelys, and from the taxon of the Oleron Island, in the absence of a nuchal notch.
Because the relative abundance of a given taxon is influenced by sample size (particularly for rarer taxa) and fluctuations in the abundance of other taxa within the sample, examination of taxonomic rank can help establish the overall importance of a particular taxon.
Apparently, the diverse appearance of the flowers is a typical trait for this taxon.
"Over the years, Herb Kay has proven himself to be an excellent predictor of market trends, as well as an outspoken consumer advocate." said Carolyn Kraus, President of Taxon Group.
5) North Carolina Biotic Index (NCBI)--This metric uses environmental tolerance values indicative of each taxon's sensitivity to environmental perturbation.
In order to test the hypothesis that the first intron of a gene is usually bigger in size in comparison to the rest, the size of the first introns of CD36 gene was determined in each taxon. All the introns of each taxa were plotted separately based on sizes (Fig.