nominotypical

Of a subspecies: nominate, having a name which repeats the species name, designating that it represents the originally described population.

Motacilla alba alba is the nominotypical subspecies of the white wagtail (Motacilla alba).

Of a subgenus or other infrageneric taxon: having a name which repeats the genus name, indicating that it includes the type species. For older botanical subgeneric and sectional names, it is sometimes prefixed with Eu-.

Four species of the nominotypical subgenus are positively recorded from America north of Mexico... [referring to Physonota (Physonota) arizonae and three other species]