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In biological classification, class (Latin: classis) is a taxonomic rank, as well as a taxonomic unit, a taxon, in that rank. It is a group of related taxonomic orders. [a] Other well-known ranks in descending order of size are life, domain, kingdom, phylum, order, family, genus, and species, with class ranking between phylum and order. [1]
In his landmark publications, such as the Systema Naturae, Carl Linnaeus used a ranking scale limited to kingdom, class, order, genus, species, and one rank below species. Today, the nomenclature is regulated by the nomenclature codes. There are seven main taxonomic ranks: kingdom, phylum or division, class, order, family, genus, and species.
The following is a list of the classes in each phylum of the kingdom Animalia. There are 107 classes of animals in 33 phyla in this list. However, different sources give different numbers of classes and phyla. For example, Protura, Diplura, and Collembola are often considered to be the three orders in the class Entognatha. This list should by ...
Systematic biology (hereafter called simply systematics) is the field that (a) provides scientific names for organisms, (b) describes them, (c) preserves collections of them, (d) provides classifications for the organisms, keys for their identification, and data on their distributions, (e) investigates their evolutionary histories, and (f ...
starfish (class), Asteroidea: All pages with titles beginning with Astero – All pages with titles beginning with Astro: ater: L: dull black: common chuckwalla, Sauromalus ater; Eurasian coot, Fulica atra; black swan, Cygnus atratus; black yarrow, Achillea atrata; creek chub, Semotilus atromaculatus see also niger
Taxonomic classes sorted by domain (Archaea, Bacteria, Eukaryotes) or by informal grouping (Algae). Subcategories This category has the following 6 subcategories, out of 6 total.