longidorsalis, Utiaritichthys Jégu [M.], de Morais [L. T.] & Santos [G. M. dos] 1992:114, Figs. 1, 7a, 7b, 8 [Cybium v. 16 (no. 2); ref. 19734] Rio Aripuana, 3 kilometers from above the Dardanellos Fall, Madeira basin, 60°40'W, 9°10'S, Brazil. Holotype: INPA 3638. Paratype: INPA 4811 (1). •Valid as Utiaritichthys longidorsalis Jégu, de Morais & Santos 1992 -- (Jégu in Reis et al. 2003:192 [ref. 27061], Pereira & Castro 2014:397 [ref. 33385], Andrade et al. 2016:165 [ref. 34307], Ota et al. 2024:432 [ref. 40817]). Current status: Valid as Utiaritichthys longidorsalis Jégu, de Morais & Santos 1992. Serrasalmidae: Myleinae. Distribution: South America: Madeira River drainage, western Amazon River basin, Brazil. Habitat: freshwater.