The legion, in biological taxonomy, is a non-obligatory taxonomic rank within the Linnaean hierarchy which is subordinate to the class but superordinate to the cohort. It consists of a group of related orders and has been employed in some classifications of birds and mammals.

Legions may be grouped into superlegions or subdivided into sublegions, and these again into infralegions.[1]

See also

* Mammal classification

Notes

1. ^ Full use is made of all of these (along with cohorts and supercohorts) in, for example, McKenna and Bell's classification of mammals