Monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon

• A monotypic order has only one family, the number of genera does not matter.
• A monotypic family has only one genus, the number of species does not matter.
• A monotypic genus has only one species, the number of subspecies does not matter.
• A monotypic species does not have any subspecies.