guyanensis, Exodon Puyo [J.] 1948:78 [1], Fig. 1 [Bulletin de la Société d'Histoire Naturelle de Toulouse v. 83 (nos 1-2); ref. 13029] Confluent of Ouaqui and Tampoc, Upper Maroni River, French Guiana. Neotype: MNHN 1959-0038. On p. 1 of separate. Neotype designated by Géry 1959:347 [ref. 1579]; original 3 syntypes apparently lost. See nomenclatural comments in Lucena & Lucinda in Reis et al. 2003:155-156 [ref. 27061]; neotype not regarded as valid by them, but that is probably incorrect since the designation was in 1959 and does not come under the 1999 code. See also Moreira & Lima 2011:315 [ref. 31389] who correctly regard the neotype as valid.. •Species inquirenda -- (Lucena & Lucinda in Reis et al. 2003:155 [ref. 27061]). •Species inquirenda in Characidae -- (Reis et al. 2003:159 [ref. 27061]). •Valid as Roeboexodon guyanensis (Puyo 1948) -- (Géry et al. 1991:44 [ref. 21021], Planquette et al. 1996:318 [ref. 22818], Moreira & Lima 2011:313 [ref. 31389], Borstein et al. 2022:16 [ref. 39507], Lucena & Santos 2024:269 [ref. 40817]). Current status: Valid as Roeboexodon guyanensis (Puyo 1948). Characidae: Exodontinae. Distribution: South America: Amazon, Tocantins, Xingu and Tapajós River basins (Brazil) and Tapanahony River drainage (Suriname). Habitat: freshwater.