An un-named Eosamon Yeo & Ng, 2007 (Brachyura: Potamidae) specimen was discovered in the reference collection of the Natural History Museum, London. Further investigation of this freshwater crab proved it to be of interest because it is the first record of the genus from Cambodia and the male to be a hitherto undescribed Eosamon species. The new species, E. cambodiense n. sp., is here described, illustrated and compared with other congeners: E. brousmichei (Rathbun, 1904), E. paludosum (Rathbun, 1904), E. hafniensis (Bott, 1966), E. yotdomense (Naiyanetr, 1984), E. boonyaratae (Naiyanetr, 1987), E. phuphanense Naiyanetr, 1992, and E. nominathuis Yeo, 2010.
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