magnus, Tridensimilis Canto [A. L. C.], Datovo [A.], Ohara [W. M.], de Pinna [M. C. C.] & Ribeiro [F. R. V.] 2026:4, Figs. 1-9 [Neotropical Ichthyology v. 24 (no. 2): e250209; ref. 43280] Igarapé Branco, tributary to rio Aruri Grande, rio Jamanxim drainage, rio Tapajós basin, Itaituba Municipality, Pará State, Brazil, 05°24'9.07"S, 55°52'59.01"W. Holotype: MZUSP 131529. Paratypes: INPA, MZUSP, UFOPA. •Valid as Tridensimilis magnus Canto, Datovo, Ohara, de Pinna & Ribeiro 2026. Current status: Valid as Tridensimilis magnus Canto, Datovo, Ohara, de Pinna & Ribeiro 2026. Trichomycteridae: Tridentinae. Distribution: South America: upper and middle Tapajós River basin, Brazil. Habitat: freshwater.