Two new sinistral species of the genus Satsuma A. Adams, 1868, Satsumasquamigera sp. n. and Satsumaadiriensis sp. n., from southern Taiwan are described. Satsumasquamigera sp. n. is characterized by a microsculpture comprising coarse, irregularly-spaced ridges and dense, easily-dislodged triangular scales on its sinistral shell, an angulated periphery, and partly-opened umbilicus. This species inhabits secondary forests in lowland hills. Satsumaadiriensis sp. n. is characterized by a thin, fragile smooth shell with microsculpture of coarse, loose ridges, a rounded periphery, completely-opened umbilicus, and elongated penial verge formed by two main pilasters. This new species was collected in a mountainous, mid-elevation, broad-leafed forest.
Keywords: Gastropoda; Stylommatophora; anatomy; land snail; sinistral; taxonomy.