hainanensis, Opsariichthys Nichols [J. T.] & Pope [C. H.] 1927:367, Fig. 33 [Bulletin of the American Museum of Natural History v. 54 (art. 2); ref. 5747] Nodoa [Noda], Hainan Island, China. Holotype: AMNH 8377. Paratypes or non-types: MCZ 32657 [ex AMNH] (1). •Synonym of Opsariichthys uncirostris (Temminck & Schlegel 1846) -- (Yang & Hwang 1964:41 [ref. 13497]). •Synonym of Opsariichthys bidens Günther 1873 -- (Kuang in Kuang et al. 1986:46 [ref. 26639], Ye & Song in Pan et al. 1991:76 [ref. 23876], Chen & Chu in Chen et al. 1998:47 [ref. 23878]). •Valid as Opsariichthys hainanensis Nichols & Pope 1927 -- (Chen et al. 2009;175 [ref. 30298], Kottelat 2013:130 [ref. 32989], Huynh & Chen 2014:142 [ref. 33158], Wang et al. 2019:[6] [ref. 36521], Wang et al. 2022:1 [ref. 40033], Chen et al. 2024:11 [ref. 41608], Peng et al. 2024:29 [ref. 41610]). Current status: Valid as Opsariichthys hainanensis Nichols & Pope 1927. Xenocyprididae. Distribution: Southeast Asia: south of the Pearl River drainage and Hainan Island (China). Habitat: freshwater.