brevis, Microsternarchus Cox Fernandes [C.], Nogueira [A.], Williston [A.] & Alves-Gomes [J. A.] 2015:215, Figs. 1, 4, 5 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 164 (no. 1); ref. 33927] Amazonas State, Santa Isabel do Rio Negro, Rio Negro, Igarapé Jaradi, Brazil, 00°19′05"S, 65°18′31"W. Holotype: INPA 48028. Paratypes: ANSP, INPA, MCZ. Plus non-type specimens. Type catalog: Ferraris et al. 2017:[25] [ref. 35236]. •Valid as Microsternarchus brevis Cox Fernandes, Nogueira, Williston & Alves-Gomes 2015 -- (Ferraris et al. 2017:[25] [ref. 35236], Ochoa et al. 2020:64 [ref. 37781], Sousa et al. 2024:516 [ref. 41134]). Current status: Valid as Microsternarchus brevis Cox Fernandes, Nogueira, Williston & Alves-Gomes 2015. Hypopomidae. Distribution: South America: middle Rio Negro drainage, Amazon basin, Amazonas State, Brazil. Habitat: freshwater.