Ceylonthelphusa is a genus of freshwater crabs endemic to Sri Lanka, where they live in moist lowland forests, swamps and rivers. Many of the species are on the IUCN Red List of threatened species, with the greatest risk factor being habitat loss. Ceylonthelphusa contains these species:
Ceylonthelphusa alpina Bahir & Ng, 2005 Ceylonthelphusa armata (Ng, 1995) Ceylonthelphusa austrina (Alcock, 1909) Ceylonthelphusa callista (Ng, 1995) Ceylonthelphusa cavatrix (Bahir, 1998) Ceylonthelphusa diva Bahir & Ng, 2005 Ceylonthelphusa durrelli Bahir & Ng, 2005 Ceylonthelphusa kandambyi Bahir, 1999 Ceylonthelphusa kotagama (Bahir, 1998) Ceylonthelphusa nana Bahir, 1999 Ceylonthelphusa nata Ng & Tay, 2001 Ceylonthelphusa orthos Ng & Tay, 2001 Ceylonthelphusa rugosa (Kingsley, 1880) Ceylonthelphusa sanguinea (Ng, 1995) Ceylonthelphusa savitriae Bahir & Ng, 2005 Ceylonthelphusa sentosa Bahir, 1999 Ceylonthelphusa soror (Zehntner, 1894) Ceylonthelphusa venusta (Ng, 1995)
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