lacustris, Xiphorhamphus Lütken [C. F.] (ex Reinhardt) 1875:136 [10] [Oversigt over det Kongelige Danske Videnskabernes Selskabs Forhandlinger og dets Medlemmers Arbeider (Kjøbenhavn) 1874 (no. 3); ref. 2856] Lagoa Santa, Brazil. Syntypes: ZMUC 185 (1), 187-188 (2), 194 (1), 196 (1); MNHN 0000-9587 [ex ZMUC] (1); SMNS 2042 (1); ZMB 9192 (1). Type catalog: Bertin 1948:7 [ref. 19577], Nielsen 1974:47 [ref. 9588], Fricke 1995:9 [ref. 28100] and Fricke 2005:11 [ref. 29864] with author as Reinhardt. On p. 10 of separate. Also described in Lütken 1875:232 (and p. XVII of summary) [ref. 19674]. Authoship sometimes seen as Reinhardt in Lütken. •Valid as Acestrorhynchus lacustris (Lütken 1875) [sometimes with author as Reinhardt] -- (Menezes & Géry 1983:590 [ref. 8307], Ortega & Vari 1986:7 [ref. 9708], Menezes 1992:48 [ref. 21389], Gómez & Chebez 1996:47 [ref. 23791], Britski et al. 1999:56 [ref. 24147], Britski 2001:21 [ref. 26046], Menezes in Reis et al. 2003:232 [ref. 27061], López et al. 2003:34 [ref. 27366], Menni 2004:74 [ref. 28131], Toledo-Piza 2007:755 [ref. 29426], Sarmiento et al. 2014:183 [ref. 35004], DoNascimiento et al. 2017:[6] [ref. 35679], Reis et al. 2020:456 [ref. 38364], Silva et al. 2020:4 [ref. 37809], Meza-Vargas et al. 2021:15 [ref. 39298], Koerber et al. 2023:4 [ref. 40665], Quintela et al. 2023:6 [ref. 40727]). Current status: Valid as Acestrorhynchus lacustris (Lütken 1875). Acestrorhynchidae: Acestrorhynchinae. Distribution: South America: Rio São Francisco and upper Paraná River basins (Argentina, Brazil and Bolivia). Habitat: freshwater.