nanus, Priocharax Toledo-Piza [M.], Mattox [G. M. T.] & Britz [R.] 2014:231, Figs. 1-4 [Neotropical Ichthyology v. 12 (no. 2); ref. 33370] Amazonas, Santa Isabel do Rio Negro, rio Negro basin, lake at right bank of rio Urubaxi, near igarapé Tapage, Brazil, 0°33’44.2"S, 64°49’40.8"W. Holotype: MZUSP 114014. Paratypes: INPA 39891 (4); MZUSP 114015 (9, 3 c&s), 114016 (5, 2 c&s), 114017 (3), 114018 (11); USNM 427007 (4). •Valid as Priocharax nanus Toledo-Piza, Mattox & Britz 2014 -- (Mattox et al. 2020:432 [ref. 37712], Mattox et al. 2021:15 [ref. 38426], Mattox et al. 2023:15 [ref. 39984]). Current status: Valid as Priocharax nanus Toledo-Piza, Mattox & Britz 2014. Acestrorhynchidae: Heterocharacinae. Distribution: South America: Rio Negro basin, Amazonas, Brazil. Habitat: freshwater.