signatus, Tetragonopterus Burmeister [H. K.] 1861:535 [Reise durch die La Plata-Staaten v. 2; ref. 23859] Río Paraná, near Rosario, Argentina. Holotype (unique): Whereabouts unknown. For English and Spanish translation see Koerber & Litz 2008:4 [ref. 29451]. •Valid as Tetragonopterus signatus Burmeister 1861 -- (Koerber 2011:4 [ref. 31122], Koerber 2014:4 [ref. 33621], Mirande & Koerber 2015:23 [ref. 35117]). •Species inquirenda -- (Toledo-Piza et al. 2024:288 [ref. 40817]). Characidae: Stethaprioninae. Habitat: freshwater.