Reference

Y. Azuma, M. Azuma (1991): Description of a new fossil subspecies of the genus Nesiohelix Kuroda & Emura, 1943 (Pulmonata: Bradybaenidae) from Kita-Daitojima Island, eastern Okinawa, Japan – "Venus", the Japanese Journal of Malacology – 50: 181 - 184.