gracilis, Acanthopsoides Fowler [H. W.] 1934:103, Fig. 55 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 86; ref. 1417] Chieng Mai [Chiang Mai], Chao Phraya River basin, Mekong basin, northern Thailand. Holotype: ANSP 56999. Paratypes: ANSP 57000-06 (7), 57007 (1, c&s). Additional material: (57). Type catalog: Böhlke 1984:63 [ref. 13621]. •Valid as Aperioptus gracilis (Fowler 1934) -- (Page & Tangjitjaroen 2015:179 [ref. 33815]). •Valid as Acanthopsoides gracilis Fowler 1934 -- (Roberts 1989:94 [ref. 6439], Siebert 1991:101 [ref. 20084], Zhu 1995:127 [ref. 25213], Doi 1997:14 [ref. 22832], Kottelat 2012:22 [ref. 32367], Kottelat 2013:177 [ref. 32989], Zhang et al. 2016:151 [ref. 34477], Fu et al. 2021:9567 [ref. 39347]). Current status: Valid as Acanthopsoides gracilis Fowler 1934. Cobitidae. Distribution: Southeast Asia: Mekong basin (Thailand and China). Habitat: freshwater.