Curculionichthys tukana Roxo, Dias, Silva & Oliveira, 2017: 260, fig. 1.

Paratypes: 1 lot, 2 specimens — All from Brazil, rio Tocantins basin. NUP 19280, 2, 23.7–24.0 mm SL: Brazil, Maranhão, Feira Nova do Maranhão, córrego Bom Jardim, tributary of rio Caraíbas, rio Tocantins basin 07°04’05”S, 46°35’50”W, A. Akama & E.G. Baena, 25 Mar 2005 .