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Published: 2017-02-15

A new genus and new species of Potamidea (Crustacea: Decapoda: Brachyura: Potamoidae), the first stygomorphic cave crab known from China and East Asia

Palaeontology, Geobiology and Earth Archives Research Centre, School of Biological, Earth and Environmental Sciences, UNSW, Kensington, NSW 2052, Australia Australian Museum, 6 College Street, Sydney, NSW 2010, Australia School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China
Department of Life Science and Research Center for Global Change Biology, National Chung Hsing University, Taichung 402, Taiwan
Lee Kong Chian Natural History Museum, Faculty of Science, National University of Singapore, Kent Ridge, Singapore 119260, Republic of Singapore
Crustacea Diyutamon cereum new genus new species caves stygobite 16S rDNA


A new genus and species of freshwater crab, Diyutamon cereum n. gen., n. sp., is described from a cave in Guizhou, China. This is the first record of a true stygomorphic crab from China and East Asia, possessing pale body coloration, strongly reduced eyes, and long ambulatory legs. While superficially similar to Chinapotamon Dai & Naiyanetr, 1994, and Tiwaripotamon Bott, 1970, the new genus possesses a diagnostic combination of carapace, ambulatory leg, thoracic sternal, and male abdominal characters that easily distinguishes it from other genera. Molecular data derived from the mitochondrial 16S rDNA supports the establishment of the new genus.



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