compressus, Tetragonopterus Günther [A.] 1864:319 [Catalogue of the fishes in the British Museum v. 5; ref. 1974] Essequibo River, Guyana. Lectotype: BMNH 1864.1.21.67. Paralectotypes: BMNH 1845.6.22.182 (1), 1845.6.22.185 (1), 1845.6.22.308 (1), 1854.2.25.6 (1), 1864.1.21.68 (1). Lectotype selected by Reis 1989:23 [ref. 14219]. •Valid as Poptella compressa (Günther 1864) -- (Reis 1989:20 [ref. 14219], Chang & Ortega 1995:3 [ref. 24302], Lasso et al. 2001:96 [ref. 25928], Reis in Reis et al. 2003:210 [ref. 27061], Barriga Salazar 2014:109 [ref. 35745], Sarmiento et al. 2014:50, 185 [ref. 35004], Ramos et al. 2014:4 [ref. 35321], DoNascimiento et al. 2017:46 [ref. 35633], Garcia-Ayala et al. 2017:571 [ref. 35695], Urbano-Bonilla et al. 2018:89 [ref. 35773], Garcia-Ayala & Benine 2019:7 [ref. 36770], Garcia-Ayala & Benine 2021:7 [ref. 38089], Meza-Vargas et al. 2021:19 [ref. 39298], Koerber et al. 2022:35 [ref. 39235], Taphorn et al. 2022:19 [ref. 41297], Cortés Hernández et al. 2023:455 [ref. 40760], Vieira et al. 2023:17 [ref. 40759], Limeira-Filho et al. 2024:5 [ref. 41573]). Current status: Valid as Poptella compressa (Günther 1864). Acestrorhamphidae: Stethaprioninae. Distribution: South America: Orinoco and Amazon River basins and coastal drainages of northern South America (Bolivia, Brazil, Colombia, Ecuador, Guyana, Peru and Venezuela). Habitat: freshwater.