gracilimus, Moenkhausia lepidurus Eigenmann [C. H.] 1908:104 [Bulletin of the Museum of Comparative Zoology v. 52 (no. 6); ref. 1221] Villa Bella; Serpa, Amazon River, Brazil. Syntypes: (21) MCZ 20983 (now 13), USNM 120279 [ex MCZ 20983] (4) Serpa. Type catalog: Vari & Howe 1991:30 [ref. 19022]. •Valid as Moenkhausia gracilima Eigenmann 1908 -- (Géry 1992:71 [ref. 20972], Benine 2002:293 [ref. 26541], Benine in Reis et al. 2003:147 [ref. 27061], Marinho & Langeani 2010:60 [ref. 30941], Marinho & Langeani 2010:887 [ref. 30927], Oliveira & Marinho 2016:573 [ref. 34342], Marinho & Langeani 2016:348 [ref. 34416], Melo et al. 2016:133 [ref. 34701], Soares et al. 2017:261 [ref. 35237], Bogotá-Gregory et al. 2020:1399 [ref. 37878], Reis et al. 2020:459 [ref. 38364] as cf. gracilima, Marinho & Benine 2024:227 [ref. 40817]). Current status: Valid as Moenkhausia gracilima Eigenmann 1908. Acestrorhamphidae: Stichonodontinae. Distribution: South America: Amazon River basin, Madeira, Tapajós, and Trombetas basins (Brazil and Colombia). Habitat: freshwater.