The freshwater crab genus Nanhaipotamon is endemic to southern China and Taiwan. The taxonomic state of the genus is not entirely understood, as is the distribution of the known species. Many species only exist in a small range, for example N. zhuhaiense, only known from a few hill stream in the city of Zhuhai. Nanhaipotamon guangdongense was described 1997 by Dai from an unknown site in Guangdong province. 2012, Huang et al. found specimens of N. guangdongense living sympatrically with N. zhuhaiense, the first record of the species since 1997.I found this specimen and many more hidden in deep burrows next to small hill streams between 50 and 300 m above sea level in a subtropic hill forest. Adults left their burrows only at night, stayed near the entrance but only went back when approached directly (30 cm distance). N. zhuhaiense was not found at any of the visited sites. Zhuhai, Guangdong.
Wissenschaftliche Ergebnisse der Deutschen Tiefsee-Expedition auf dem Dampfer "Valdivia" 1898-1899. bd.6. AtlasJena,G. Fischer,1902-40.biodiversitylibrary.org/page/6307506
Report on the zoological collections made in the Indo-Pacific Ocean during the voyage of H.M.S. 'Alert' 1881-2.London :Printed by order of the Trustees,1884. biodiversitylibrary.org/page/12067720
Wissenschaftliche Ergebnisse der Deutschen Tiefsee-Expedition auf dem Dampfer "Valdivia" 1898-1899. bd.6. AtlasJena,G. Fischer,1902-40.biodiversitylibrary.org/page/6307614
on the banks of Pumpkin Creek, there are so many fiddler crabs when the tide is out. They really are quite funny to watch, posturing and carrying on. O