williaminae, Parachela Fowler [H. W.] 1934:111, Fig. 63 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 86; ref. 1417] Mekong River at Chieng Sen [Chiengsan / Chiang Sen], Chiang Rai Province, northern Thailand. Holotype (unique): ANSP 57457. Type catalog: Monkolprasit 1969:11 [ref. 25088], Böhlke 1984:95 [ref. 13621]. •Valid as Oxygaster williaminae (Fowler 1934) -- (Bănărescu 1971:18 [ref. 20612]). •Valid as Parachela williaminae Fowler 1934 -- (Rainboth 1996:69 [ref. 22772], Doi 1997:10 [ref. 22832], Kottelat 2001:68 [ref. 25780], Kottelat 2013:138 [ref. 32989], Taki et al. 2021:76 [ref. 39830], Page et al. 2024:19 [ref. 41603]). Current status: Valid as Parachela williaminae Fowler 1934. Xenocyprididae. Distribution: Southeast Asia: Mekong and Chao Phraya River basins, Laos, Thailand and Cambodia. Habitat: freshwater.