A genus is a taxonomic unit consisting of a single species or a group of species united by a common origin.

A taxonomic category that unites closely related species. For example, different fish species such as asyar, omul, chir, whitefish, muksun, pelyad, tugun are united in the genus whitefish (Coregonus) or spruce and yazd belong to the genus spruce - Leuciscus.