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In the latter, a species represents a group of distinctly identifiable organisms which are sexually isolated from the members of other species. Thus, the concept of a bacterial species is different from the species concept applicable to higher organisms, like plants and animals. So, a bacterial species, according to the above definition, comprises a number of strains which are closely similar, differing in one or a few characteristics. A strain is defined as the descendants of a single colony of a pure culture.Ī colony ideally is formed from a single cell or spore growing on an agar medium. In case of bacteria, a species is defined as a collection of strains which resemble each other in many characteristics and differ significantly from other collections of strain. The basic taxonomic unit of biological organisms is a species. In recent times, particularly in bacterial taxonomy, a rank above kingdom level has been created, called a domain. Similarly, a group of families form an order, several orders form a class and several classes, a kingdom. A group of genera is then collected to form the next higher taxon, called a family. A group of several species is then assembled into the next higher unit, called a genus (pl. For example, organisms having the highest similarity are placed in one taxonomic unit, called a species.
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