∞ generated and posted on 2016.02.16 ∞
Groups of species whose members are more closely related to each other than they are to other such groups.
Taxa often are given names and are associated, when formally presented, with indicators of what level hierarchical classification. For example, class Mammalia or domain Bacteria.
Properly delineated, a taxon, particularly those higher than the level of species, can be described as a clade, that is, as monophyletic.