rara, Moenkhausia Zarske [A.], Géry [J.] & Isbrücker [I. J. H.] 2004:21, Figs. 1-2, 6 [Zoologische Abhandlungen; Staatliches Museum für Tierkunde in Dresden v. 54; ref. 28038] At air strip, one day upstream of Oelemari (Ulemari), rapid in Oelemari (Ulemari) River, Marowijne, Suriname. Holotype: IRSNB 830. Paratypes: IRSNB 831-832 (7, 2); MNHN 2004-2472 (1); MTD F 28333 (1); ZMA 119715 (1), 120248 (3), 123729 (1). •Valid as Tetragonopterus rara (Zarske, Géry & Isbrücker 2004) -- (Melo et al. 2011:49 [ref. 31233]). •Valid as Tetragonopterus rarus (Zarske, Géry & Isbrücker 2004) -- (Silva & Benine 2011:50 [ref. 31347], Silva et al. 2013:1629 [ref. 32576], Araujo & Lucinda 2014:315 [ref. 33377], Melo et al. 2015:711 [ref. 35424], Silva et al. 2016:23 [ref. 34929], Borstein et al. 2022:16 [ref. 39507], Melo et al. 2024:281 [ref. 40817]). Current status: Valid as Tetragonopterus rarus (Zarske, Géry & Isbrücker 2004). Characidae: Tetragonopterinae. Distribution: South America: various streams in Suriname, French Guiana and Brazil. Habitat: freshwater.