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Somanniathelphusa zanklon Ng & Dudgeon, 1992 is a tropical freshwater crab currently considered endemic to Hong Kong.Â The present study shows that S. zanklon has been found in a variety of lotic and lentic habitats, mostly lowland, slow moving streams and marshes.Â The species is more widely distributed than previously known, and potentially occurs outside Hong Kong.Â However, its habitat is under threat from development and channelization of watercourses.Â The life cycle of the crab requires both slow moving streams and marshes for adults and adjacent terrestrial habitats for brooding females, highlighting the need for integrated conservation of lowland streams and their riparian corridors.Â It is hoped that understanding of the species habitat requirements will encourage others to further explore lowland watercourses in the Pearl River Delta and aid in habitat conservation.Â
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