serrazul, Hemigrammus Ferreira [K. M.], Ribeiro [A. C.] & Carvalho [F. R.] 2026:3, Figs. 1-5 [Neotropical Ichthyology v. 24 (no. 1): e250157; ref. 42821] Unnamed stream, rio Cuiabazinho tributary, upper rio Paraguai basin, SESC Serra Azul Park, Rosário Oeste municipality, Mato Grosso State, Brazil, 14°29'43.74"S, 55°43'59.96"W, elevation 280 meters. Holotype: CPUFMT 8654. Paratypes: CITL, CPUFMT, DZSJRP, MZUSP, ZUEC. •Valid as Hemigrammus serrazul Ferreira, Ribeiro & Carvalho 2026. Current status: Valid as Hemigrammus serrazul Ferreira, Ribeiro & Carvalho 2026. Acestrorhamphidae: Pristellinae. Distribution: South America: Cuiabazinho River drainage, upper Cuiabá River basin, SESC Serra Azul Park, Mato Grosso State, Brazil. Habitat: freshwater.