Abstract: Objective  To describe a new species of the genus Nanhaipotamon.  Methods  Freshwater crabs were collected in the counties of Yongtai, Minqing, Youxi, Songxi, Zhenghe and Shouning, Fujian Province. The morphological characteristics of the crabs were described. The habitats were observed and crabs examined for the presence of Paragonimus metacerariae.  Results  Ａ new species of freshwater crabs named as Nanhaipotamon fujianense sp. nov. was described: holotype（FJ6132-1）: ♂, carapace length 18.44 mm, breadth 23.64 mm, thickness 12.61 mm; allotype（FJ6132-2）: ♀, length 18.76 mm, breadth 25.25 mm, thicknes 14.31 mm, collected from Yongtai County in the middle of Fujian （N 25°44,778′; E118°32,278′, and 232 m above sea lever）. Distal segment of the first male pleopod with triangle convex inner-distal angle, and the axe-like expanded out-distal angle. The out-lateral border slightly sloped downwards. The segment length is 2.1 times as long as the subdistal segment. The crabs usually lived in the crevice of small stream. Paragonimus metacerariae were found in the crabs collected from Yongtai, Minqing, Youxi, Songxi and Zhenghe Counties.   Conclusion  Ａ new species of freshwater crab（Nanhaipotamon fujianense sp. nov.） has been recorded which serves as the intermediate hosts of Paragonimus skrjabini.

Key words: Nanhaipotamon, New species, Paragonimus skrjabini, Intemedate host, Fujian