Ptychognathus hachijyoensis
- Fukui, Y., K. Wada & C.-H. Wang 1989. Ocypodidae, Mictyridae and Grapsidae (Crustacea: Brachyura) from some coasts of Taiwan. Journal of Taiwan Museum, 42(1): 225-238, figs 1-25, tabs 1-3.
- Sakai, T. 1955b. Further notes on the Brachyuran Crustacea of the Hachijo Island. Records of Oceanographic Works in Japan, 2(1): 193-202, figs 1-2.
- Sakai, T. 1976a. Crabs of Japan and the Adjacent Seas. (In 3 volumes: (1) English text: i-xxix, 1-773, figs 1-379, (2) Plates volume: 1-16, pls 1-251, (3) Japanese text: 1-461, figs 1-2, 3 maps.) Kodansha Ltd, Tokyo.