nigromarginata, Moenkhausia Costa [W. J. E. M.] 1994:22, Figs. 1-2 [Zoologischer Anzeiger v. 232 (no. 1-2); ref. 22048] Small stream, tributary to Rio Tapajós, near road MT-170, about 10 kilometers north of Campo Novo do Parecis, Mato Grasso, Brazil. Holotype: MNRJ 12429. Paratypes: MHNG 2542.18 (5); MNRJ 12430 (5); MZUSP 45289 (5); NRM 20052 (5), UFRJ 1319 (7), 1320 (c&s). Type catalog: Oyakawa 1996:482 [ref. 23140]. •Valid as Moenkhausia nigromarginata Costa 1994 -- (Benine 2002:292 [ref. 26541], Benine in Reis et al. 2003:149 [ref. 27061], Sousa et al. 2010:262 [ref. 30863], Pastana & Dagosta 2014:390 [ref. 33384], Dagosta et al. 2016:258 [ref. 34377], Dagosta & Marinho 2016:[7] [ref. 34498], Carvalho et al. 2017:9 [ref. 35509], Soares et al. 2019:237 [ref. 36688], Marinho & Dagosta 2023:6 [ref. 40358], Marinho & Benine 2024:232 [ref. 40817]). Current status: Valid as Moenkhausia nigromarginata Costa 1994. Characidae: Stethaprioninae. Distribution: South America: upper Tapajós River basin, Mato Grosso State, Brazil. Habitat: freshwater.