Type species is Oliva nana Lamarck, 1811. Kantor, Fedosov, Puillandre, Bonillo & Bouchet (2017: 36) stated: “This type designation was overlooked and later Cossmann (1899: 54) designated Olivella mutica (Say, 1822) [an originally included species] as the type species. Olsson followed Cossmann, but did not include Oliva nana in his monograph. Therefore, the subgeneric position of O. nana as well as the composition of the subgenus remain unclear. Micana Gray, 1858. Type species: Oliva nana Lamarck, 1811; M. A junior objective synonym of Dactylidia.
Thee extant species included in this genus are all from the Tropical Atlantic realm, Gulf of Guinea province, and mainly distributed in the southern part of that province (Angola north to Gabon).