Pseudexostoma, Zhou & Yang & Li & Li, 2007

Zhou, Wei, Yang, Ying, Li, Xu & Li, Ming-Hui, 2007, A Review Of The Catfish Genus Pseudexostoma (Siluriformes: Sisoridae) With Description Of A New Species From The Upper Salween (Nujiang) Basin Of China, Raffles Bulletin of Zoology 55 (1), pp. 147-155 : 153-154

Key to species of the genus Pseudexostoma

1. Posterior margin of lower lip with three notches, depth of middle notch shallower than depth of lateral ones, length of two smaller median lobes of lower lip longer than lateral lobes; pelvic fin i, 3-4; base of adipose fin 36.1–46.0% SL; depth of caudal peduncle 4.2–6.9% SL and 20–33.7% in length of caudal peduncle; premaxillary tooth band with 16–18 teeth (vs. 18–22), divided into two isolated patches ...................................................... 2

– Posterior margin of lower lip with three notches, depth of middle notch the same depth as lateral ones, length of two smaller median lobes of lower lip the same as lateral lobes; pelvic fin i, 5; base of adipose fin 28.8–39.8% SL; depth of caudal peduncle 6.4–8.3% SL and 32.6–42.7% in length of caudal peduncle; premaxillary tooth band with18–22 teeth, divided into two partially connected patches (Irrawaddy River) ....................... ........................................................................ P. yunnanensis

2 Pectoral fin, pelvic fin and caudal fin longer, pectoral fin 30.1– 31.3% SL, pelvic fin 23.1–24.3% SL, caudal fin 18–19.6% SL; eye diameter 8.2–10% HL, interorbital width 25.5–30.8% HL (Salween River) ............................................... P. longipterus

– Pectoral fin, pelvic fin and caudal fin shorter, pectoral fin 24.9– 29.8% SL, pelvic fin 16.1–22.9% SL, caudal fin 13.6–17.9% SL; eye diameter 5.8–7.8% HL, interorbital width 19.7–24.7% HL (Salween River) ....................................... P. brachysoma