the world > relative properties > number > specific numbers > one > only one > [adjective] > having only one representative (3)
Designating a taxon whose subordinate taxa closely resemble one another. Also: = monotypic, adj. 1b.
Taxonomy. That is a monotype; that is the sole representative of a genus or other taxon. rare.
Taxonomy. Of a genus or higher taxon: containing only one species. Later also, of a species: having no constituent subspecies or varieties.