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Osawa, M. and Ng, N. 2006.

A new species of Ptychognathus Stimpson, 1858 (Crustacea: Decapoda: Brachyura: Varunidae) from the Ryukyu Islands, southwestern Japan

. Zootaxa. 1260, 1 (Jul. 2006), 57–66. DOI:https://doi.org/10.11646/zootaxa.1260.1.5.