Glossary of scientific naming

The main ranks are kingdom (regnum), phylum or division (divisio), class (classis), order (ordo), family (familia), genus and species.

Further levels in the hierarchy can be made by the addition of prefixes such as sub-, super-, infra-, and so on.

Divisions such as "morph", "form", "variety", "strain", "breed", "cultivar", hybrid (nothospecies) and "landrace" are used to describe various sub-specific groups in different fields.

It is possible for a clade to be unranked, for example Psoroptidia (Yunker, 1955) and the SAR supergroup.

Note that in zoology the English descriptions, such as "conserved name", for example, are acceptable and generally used.