Subspecies

Subspecies (commonly abbreviated subsp. or ssp.) in biological classification, is either a taxonomic rank subordinate to species, or a taxonomic unit in that rank (plural: subspecies). A subspecies cannot be recognized in isolation: a species will either be recognized as having no subspecies at all or two or more, never just one.

Examples

 * Beta vulgaris subsp. vulgaris var. vulgaris
 * Pectobacterium carotovorum subsp. atrosepticum

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