Sakai, T. (1955). Further Notes on the Brachyuran Crustacea of the Hachijo Island. <em>Records of Oceanographic Works in Japan.</em> 2(1): 193-202.[details] Available for editors
DecaNet eds. (2025). DecaNet. Ptychognathus hachijoensis Sakai, 1955. Accessed through: Odido, M.; Appeltans, W.; BelHassen, M.; Mussai, P.; Nsiangango, S.E.; Vandepitte, L.; Wambiji, N.; Zamouri, N. Jiddou, A.M. (Eds) (2025) African Register of Marine Species at: https://www.marinespecies.org/afremas/aphia.php?p=taxdetails&id=444810 on 2026-09-01
Odido, M.; Appeltans, W.; BelHassen, M.; Mussai, P.; Nsiangango, S.E.; Vandepitte, L.; Wambiji, N.; Zamouri, N. Jiddou, A.M. (Eds) (2026). African Register of Marine Species. Ptychognathus hachijoensis Sakai, 1955. Accessed at: https://www.marinespecies.org/afremas/aphia.php?p=taxdetails&id=444810 on 2026-09-01
original descriptionSakai, T. (1955). Further Notes on the Brachyuran Crustacea of the Hachijo Island. <em>Records of Oceanographic Works in Japan.</em> 2(1): 193-202.[details] Available for editors
basis of recordLiu, J.Y. [Ruiyu] (ed.). (2008). [Checklist of marine biota of China seas]. <em>China Science Press.</em> 1267 pp. (look up in IMIS) [details] Available for editors
Present Inaccurate Introduced: alien Containing type locality