nana, Characidium Mendonça [M. B.] & Netto-Ferreira [A. L.] 2015:188, Fig. 1 [Zootaxa 4021 (no. 1); ref. 33967] Pará, Rio 13 de Maio, approximately 40 km from Castelo dos Sonhos, Brazil, 8°38'54.65"S, 55°01'45.04"W. Holotype: MPEG 31838. Paratypes: INPA, MNRJ, MPEG, MZUSP. Plus non-type material. •Valid as Characidium nana Mendonça & Netto-Ferreira 2015 -- (Melo & Espíndola 2016:566 [ref. 34928], Zanata et al. 2018:84 [ref. 36279], Zanata et al. 2024:8 [ref. 41604]). Current status: Valid as Characidium nana Mendonça & Netto-Ferreira 2015. Crenuchidae: Characidiinae. Distribution: South America: Rio Xingu basin, Pará, Brazil. Habitat: freshwater.