royal, Synbranchus Sabaj Pérez [M. H.], Arce H. [M.] & de Sousa [L. M.] in Sabaj Pérez, Arce H., Donahue, Cramer & de Sousa 2022:8, Figs. 3A-B, 5 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 166; ref. 39304] Rapids, channels and pools just upstream of cachoeira do Jericoá, Rio Xingu, Pará, Brazil, 3°21'54.1"S, 51°43'58.9"W. Holotype: INPA 47472. Paratypes: (6) ANSP, INPA, LIA. •Valid as Synbranchus royal Sabaj Pérez, Arce H. & de Sousa 2022. Current status: Valid as Synbranchus royal Sabaj Pérez, Arce H. & de Sousa 2022. Synbranchidae. Distribution: South America: middle Rio Xingu basin, Pará, Brazil. Habitat: freshwater.