gracilior, Hyphessobrycon Géry [J.] 1964:12, Figs. 10-11 [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 1329. Paratypes: MHNG 2150.12-13 (2), ZFMK 1330 (1). Type catalog: Busse 1984:218 [ref. 28342], Herder et al. 2010:116 [ref. 31087]. •Valid as Hyphessobrycon gracilior Géry 1964 -- (Ortega & Vari 1986:8 [ref. 9708], Lima & Malabarba in Reis et al. 2003:136 [ref. 27061], Barriga Salazar 2014:107 [ref. 35745], Dagosta et al. 2014:366 [ref. 33382], Sarmiento et al. 2014:184 [ref. 35004], DoNascimiento et al. 2017:50 [ref. 35633]). Current status: Valid as Hyphessobrycon gracilior Géry 1964. Acestrorhamphidae: Hyphessobryconinae. Distribution: Upper Amazon River basin: Ecuador, Peru, Colombia and Bolivia. Habitat: freshwater.