immaculatus, Pseudecheneis Chu [X.-L.] 1982:428, Fig. 1 [Acta Zootaxonomica Sinica v. 7 (no. 4); ref. 5245] Baijixun, upper Lancang River, Weixi County, Yunnan Province, China. Holotype: KIZ KIZ 1974000922 [ex 748742]. Paratypes: BMNH 1987.9.17.23 (1) [ex KIZ], KIZ 1974000925 [ex 748638] (1 allotype), 1974000923-24 [ex 748636-37] (2), 1974000926-27 [ex 748639-40] (2), 1974000928-30 [ex 748650-52] (3), 1974000931-35 [ex 748735-39] (5), 1974000936 [ex 748741] (1). Type catalog: Ferraris 2007:400 [ref. 29155], Du et al. 2013:355 [ref. 32939], Min et al. 2026:183 [ref. 42825]. •Valid as Pseudecheneis immaculata Chu 1982 -- (Kottelat 1998:108 [ref. 23436], Wu & Wu 1992:536 [ref. 21205] as immaculatus, Zhu 1995:154 [ref. 25213], Yang in Chen 1998:300 [ref. 23556] as immaculatus, Roberts 1998:290 [ref. 23905] as immaculatus, Chu in Chu et al. 1999:149 [ref. 24534] as immaculatus, Ng & Edds 2005:1 [ref. 28344], Zhou & Zhou 2005:418 [ref. 28435] as immaculatus, Ng 2006:46 [ref. 28737], Ng 2006:66 [ref. 28759], Thomson & Page 2006:60 [ref. 28859], Ng & Tan 2007:25 [ref. 28971] as immaculata, Vishwanath & Darshan 2007:2630 [ref. 28998] as immaculata, Ferraris 2007:400 [ref. 29155] as immaculata, Zhou et al. 2008:113 [ref. 29742] as immaculus, Anganthoibi & Vishwanath 2010:199 [ref. 31042], Kottelat 2013:231 [ref. 32989], Zhang et al. 2016:177 [ref. 34477] as immaculatus). Current status: Valid as Pseudecheneis immaculata Chu 1982. Sisoridae: Glyptosterninae. Distribution: Southeast Asia: upper Mekong [Lancangjian] River drainage, Yunnan (China). Habitat: freshwater.