tenuis, Hyphessobrycon Géry [J.] 1964:10, Figs. 8-9 [Beiträge zur Neotropischen Fauna v. 4 (no. 1); ref. 1580] Small creek connecting "Zapote Cocha" and "Caño Yarina", on edge of Río Pacaya, tributary of lower Río Ucayali, Peru. Holotype: ZFMK 1327. Paratypes: (15) ANSP 139708 (1), ZFMK 1328 (1), ZMA 113853 (1). Type catalog: Nijssen et al. 1982:20-21 [ref. 19236], Busse 1984:218 [ref. 28342], Böhlke 1984:55 [ref. 13621], Herder et al. 2010:117 [ref. 31087]. •Valid as Hyphessobrycon tenuis Géry 1964 -- (Barriga Salazar 2014:107 [ref. 35745], Carvalho & Langeani 2013:526 [ref. 32913], Meza-Vargas et al. 2021:18 [ref. 39298]). Current status: Valid as Hyphessobrycon tenuis Géry 1964. Acestrorhamphidae: Hyphessobryconinae. Distribution: South America: upper Amazon River basin (Peru and Ecuador). Habitat: freshwater.