Mahseers genera Tor and Neolissochilus (Teleostei : Cyprinidae) from southern Vietnam

摘要: Two new species and two basin records of mahseers in the genera Tor Neolissochilus are described from upper Krong No middle Đồng Nai drainages Langbiang Plateau southern Vietnam. These known streams rivers montane mixed pine evergreen forests between 140 1112 m. Their populations isolated Sre Pok River Mekong basin, An Lao River. Both differentiated their congeners by a combination following characters: 23-24 lateral scales, 9-10 predorsal 2/7 or 1/8 pelvic-fin rays, mouth position, median lobe lower lip, rostral hood, colour life divergent mitochondrial DNA. mekongensis sp. nov. is dongnaiensis number transverse scale rows (3/1/2 vs. 4/1/2), rays (2/7 1/8), blunt hood pointed, caudal-fin lobes that equal unequal, DNA (0.7% sequence divergence). Molecular evidence identifies both as members genus distinct all sampled (uncorrected divergences >1.9% for which homologous COI sequences available). sinensis recorded rivers, further south its distribution. Polymorphism stracheyi with Tor-like morph Neolissochilus-like morph.