sentences:  The range of "B. ambusticauda" is listed as including the Chao Phraya and Mae Klong drainages in Thailand; the original distribution of this species included the Chao Phraya River drainage from Bangkok upriver to the lower Nan River.It has also been reported in the Mekong Basin in Vietnam, Cambodia and Laos from the Tonlé Sap lake to the lower Nam Ngum River, but confirmed records from this basin are lacking and this is not recognized as part of its range by the IUCN.Previous records of "B. melanopterus" from the same rivers is due to confusion with "B. ambusticauda"; "B. melanopterus" only occurs in the Malay Peninsula, Sumatra, and Borneo.