Shy, J. Y. & P. K. L. Ng, 1998. On two new species of Geothulphusa Stimpson, 1858 (Decapoda, Brachyura, Potamidae) from the Ryukyu Islands, Japan. Crustaceana 71(7): 778‑784.

Shih, H.-T., 2008. Diversity of the Freshwater Crabs from the Ryukyus and Japan. Wetlands Taiwan 68: 2-23. (in Chinese)