songmaensis, Opsariichthys Nguyen [V. H.] & Nguyen [H. D.] 2000:12, Figs. 1-2 [Tap Chí Sinh Hoc (Journal of Biology) v. 22 (no. 4); ref. 26614] Song Ma (Ma River), Song Ma town, Song Ma County, Son La Province, Vietnam. Holotype: ARI I: H.01.15.02.01. Paratypes: H.01.15.02.02-03 (2); HNNU LM P.01.01.12.199 (1), P.01.02.12.99 (1), P.01.03.12.99 (1). •Questionably in the synonymy of Opsariichthys bidens Günther 1873 -- (Kottelat 2013:130 [ref. 32989]). •Valid as Opsariichthys songmaensis Nguyen & Nguyen 2000 -- (Chen et al. 2009:175 [ref. 30298], Huynh & Chen 2014:143 [ref. 33158], Peng et al. 2024:29 [ref. 41610]). •Synonym of Opsariichthys hainanensis Nichols & Pope 1927 -- (Endruweit 2025:128 [ref. 42401]). Current status: Synonym of Opsariichthys hainanensis Nichbols & Pope 1927. Xenocyprididae. Habitat: freshwater.