kaznakovi, Ptychobarbus Nikolskii [A. M.] 1903:91 [Ezhegodnik, Zoologicheskago Muzeya Imperatorskoi Akademii Nauk v. 8; ref. 15036] Dza tju [Dza-tschju], Kam Territory, Tibet. Syntypes: ZISP 12687-88 (2, 2). •Valid as Diptychus kaznakovi (Nikolskii 1903) -- (Tsao 1964:173 [ref. 13501], Ye & Fu in Ding 1994:389 [ref. 21531], Chen & Huang in Chen 1998:226 [ref. 23556], Yue & Chen 1998:156 [ref. 26415]). •Valid as Ptychobarbus kaznakovi Nikolskii 1903 -- (Wu & Wu 1992:415 [ref. 21205], Zhang et al. 1995:103 [ref. 22734], Zhu 1995:91 [ref. 25213], Chen & Cao et al. in Yue 2000:343 [ref. 25272], Chen & Chen 2001:147 [ref. 25461], Kottelat 2013:147 [ref. 32989], Zhang et al. 2016:119 [ref. 34477] [? China], Zhang et al. 2019:319 [ref. 36699], Guo 2021:430 [ref. 38617]). Current status: Valid as Ptychobarbus kaznakovi Nikolskii 1903. Cyprinidae: Schizopygopsinae. Distribution: Upper Yangtze River basin, China. Habitat: freshwater.