hesperus, Hysteronotus Böhlke [J. E.] 1958:35, Pl. 3 (fig. 2); Fig. 6 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 110; ref. 12050] Río Pucuno, Napo-Pastaza, tributary of upper River Napo, Province Napo-pastaza, Ecuador, 0°46'S, 77°12'W. Holotype: USNM 164056. Paratypes: ANSP 75912-14 (1, 1, 1), 79159 (2); USNM 164042 (1), 175124 (1). Type catalog: Vari & Howe 1991:28 [ref. 19022], Böhlke 1984:48 [ref. 13621]. •Valid as Hysteronotus hesperus Böhlke 1958 -- (Ovchynnyk 1967:29 [ref. 37559], Ortega & Vari 1986:8 [ref. 9708]). •Valid as Chrysobrycon hesperus (Böhlke 1958) -- (Weitzman & Menezes 1998:187 [ref. 23843], Weitzman in Reis et al. 2003:223 [ref. 27061], Vanegas-Ríos et al. 2011:731 [ref. 31720], Barriga Salazar 2014:109 [ref. 35745], Vanegas-Ríos et al. 2014:297 [ref. 33375], Thomaz et al. 2015: Add. 5 [ref. 33893], Vanegas-Ríos et al. 2015:181 [ref. 34047], Vanegas-Ríos & Urbano-Bonilla 2017:2355 [ref. 35265], DoNascimiento et al. 2017:54 [ref. 35633], Meza-Vargas et al. 2021:17 [ref. 39298], Vanegas-Ríos et al. 2024:683 [ref. 41166]). Current status: Valid as Chrysobrycon hesperus (Böhlke 1958). Stevardiidae: Stevardiinae. Distribution: South America: western Amazon River basin (Colombia, Ecuador and Peru). Habitat: freshwater.