bacteria species - a species of bacteria

biological science, biology - the science that studies living organisms

taxon, taxonomic category, taxonomic group - animal or plant group having natural relations

variety - (biology) a taxonomic category consisting of members of a species that differe from others of the same species in minor but heritable characteristics; "varieties are frequently recognized in botany"

breed, strain, stock - a special variety of domesticated animals within a species; "he experimented on a particular breed of white rats"; "he created a new strain of sheep"

genus - (biology) taxonomic group containing one or more species

endangered species - a species whose numbers are so small that the species is at risk of extinction

var., variant, strain, form - (biology) a group of organisms within a species that differ in trivial ways from similar groups; "a new strain of microorganisms"

type species - (biology) the species that best exemplifies the essential characteristics of the genus to which it belongs

kind, sort, form, variety - a category of things distinguished by some common characteristic or quality; "sculpture is a form of art"; "what kinds of desserts are there?"