trifurcatus, Chalcinus Castelnau [F. L.] 1855:70, Pl. 37 (fig. 1) [Animaux nouveaux or rares v. 2; ref. 766] Rio Araguay [Araguaia], Pará, Brazil. Holotype (unique): MNHN A-9837 (dry, poor condition). Type catalog: Bertin 1948:9 [ref. 19577]. •Valid as Triportheus trifurcatus (Castelnau 1855) -- (Malabarba 1998:76 [ref. 23840], Malabarba & Lima in Reis et al. 2003:158 [ref. 27061], Malabarba 2004:180 [ref. 28150], Mariguela et al. 2016:132 [ref. 34141], Malabarba 2024:437 [ref. 40817]). Current status: Valid as Triportheus trifurcatus (Castelnau 1855). Triportheidae: Triportheinae. Distribution: South America: Tocantins-Araguaia River basin, Brazil. Habitat: freshwater.