unilineatus, Poecilurichthys Gill [T. N.] 1858:420 [60] [Annals of the Lyceum of Natural History of New York v. 6 (nos 10-13, art. 38); ref. 1750] Trinidad Island, West Indies. No types known. On p. 60 of separate. •Valid as Hemigrammus unilineatus (Gill 1858) -- (Ovchynnyk 1967:29 [ref. 37559], Ortega & Vari 1986:8 [ref. 9708], Weitzman & Palmer 1997:237 [ref. 22743], Lasso et al. 2001:95 [ref. 25928] as cf. lineatus, Lima & Oyakawa in Reis et al. 2003:133-134 [ref. 27061], Mirande 2010:510 [ref. 31006], Phillip et al. 2013:16 [ref. 32896], Sarmiento et al. 2014:46, 184 [ref. 35004], Melo et al. 2016:132 [ref. 34701], DoNascimiento et al. 2017:49 [ref. 35633], Meza-Vargas et al. 2021:18 [ref. 39298], Borstein et al. 2022:16 [ref. 39507], Taphorn et al. 2022:15 [ref. 41297]). Current status: Valid as Hemigrammus unilineatus (Gill 1858). Acestrorhamphidae: Pristellinae. Distribution: South America: rivers of Trinidad, coastal river basins of Venezuela, and of Guyana, Suriname and French Guiana; Guaporé and Amazon River basins (Brazil, Colombia, Bolivia, Ecuador, French Guiana, Guyana, Peru, Suriname, Trinidad and Tobago, and Venezuela). Habitat: freshwater.