unifasciatus, Nannostomus Steindachner [F.] 1876:127 [79], Pl. 9 (fig. 1) [Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften. Mathematisch-Naturwissenschaftliche Classe v. 74 (1. Abth.); ref. 4225] Near mouth of Rio Negro, Brazil. Syntypes: (several) NMW 56514 (4), 58741 (3). On p. 79 of separate. •Valid as Poecilobrycon unifasciatus (Steindachner 1876) -- (Weitzman 1966:42 [ref. 12368]). •Valid as Nannostomus unifasciatus Steindachner 1876 -- (Weitzman & Cobb 1975:33 [ref. 7134], Weitzman & Weitzman in Reis et al. 2003:246 [ref. 27061], Sarmiento et al. 2014:81, 186 [ref. 35004], DoNascimiento et al. 2017:45 [ref. 35633], Careaga et al. 2020:76 [ref. 37774], Guimarães et al. 2020:1 [ref. 37521], Meza-Vargas et al. 2021:15 [ref. 39298], Koerber et al. 2022:27 [ref. 39235] unconfirmed, Taphorn et al. 2022:27 [ref. 41297], Marinho 2024:388 [ref. 40817]). Current status: Valid as Nannostomus unifasciatus Steindachner 1876. Lebiasinidae: Pyrrhulininae. Distribution: South America: western Amazon River basin (Bolivia, Brazil, Colombia and Peru); upper Orinoco basin (Venezuela); and Guyana Plateau (Brazil, Guyana and Venezuela); introduced in Trinidad and Tobago. Habitat: freshwater.