robertsi, Argonectes Langeani [F.] 1999:173, Figs. 1a [Naturalia (São Paulo) v. 23; ref. 24404] Lago Dumbá Grande, Barra do Garças, Rio Araguaia, GO, Brazil. Holotype: MZUSP 21528. Paratypes: BMNH 1849.11.8.54 (1); INPA 4022 (3), 4107 (1), 7735 (1), 7737-38 (2, 1); MZUSP 19269 (1), 21197 (1), 29656 (6, 1 c), 44011-12 (1, 2), 44133 (2). •Valid as Argonectes robertsi Langeani 1999 -- (Langeani in Reis et al. 2003:97 [ref. 27061], Nogueira et al. 2021:7 [ref. 38941]). Current status: Valid as Argonectes robertsi Langeani 1999. Hemiodontidae. Distribution: South America: Tapajós, Xingu, Tocantins and Capim River basins (Brazil). Habitat: freshwater.