Riau Archipelago
"Parakysis" species are found in small forest streams of Sundaic Southeast Asia. "P. anomalopteryx" originates from the Kapuas River basin in western Borneo. "P. grandis" inhabits the Kapuas and Kuching River basins in Borneo and Deli, Indragiri, and Batang Hari basins in Sumatra. "P. longirostris" is distributed in Singapore, peninsular Malaysia, and the Riau Archipelago. "P. verrucosus" is known from Peninsular Malaysia and the Riau Archipelago. The discovery of "P. notialis" in 2003 expanded the known range of "Parakysis" species to the Barito River basin in southern Borneo.