Species that contain: Oligosarcus and hepsetus [ 3 ] records

hepsetus, Hydrocyon Cuvier [G.] 1829:312 [Le Règne Animal (Edition 2) v. 2; ref. 995] No locality stated [Rio de Janeiro, Brazil]. Non-types: MNHN A-9851 (3, poor condition) Buenos Aires. Type catalog: Bertin 1948:7-8 [ref. 19577] but dated to Valenciennes 1847. On Quoy & Gaimard 1824-25, pl. 48 (fig. 2) [ref. 3574]. •Valid as Acestrorhampus hepsetus (Cuvier 1829) -- (Haro et al. 1996:6 [ref. 25004]). •Valid as Oligosarcus hepsetus (Cuvier 1829) -- (Menezes & Géry 1983:589 [ref. 8307], Menezes 1987:31 [ref. 20060], Gómez & Chebez 1996:47 [ref. 23791], Menezes in Reis et al. 2003:151 [ref. 27061], Ribeiro et al. 2007:52 [ref. 29321], Di Dario et al. 2013:262 [ref. 37503], Catelani et al. 2014:931 [ref. 37496], Litz & Koerber 2014:15 [ref. 33622], Ribeiro & Menezes 2015:77 [ref. 33768], Mirande & Koerber 2015:25 [ref. 35117], Petry et al. 2016:302 [ref. 34966], Nión et al. 2016:28 [ref. 35565] with author as Steindachner 1867, Wendt et al. 2019:5 [ref. 36952], Koerber & Serra 2020:4 [ref. 37449], Mirande & Koerber 2020:2 [ref. 37594]). Current status: Valid as Oligosarcus hepsetus (Cuvier 1829). Characidae: Stethaprioninae. Distribution: South America: Rio de Janeiro south to Laguna dos Patos (southeastern Brazil). Habitat: freshwater, brackish.

jenynsii, Xiphorhamphus Günther [A.] 1864:356 [Catalogue of the fishes in the British Museum v. 5; ref. 1974] Freshwater Lake of Maldonado, Uruguay [probably Laguna del Diario, 34°54'S, 55°00'W, Maldonado, Uruguay]. Holotype: UMZC [Darwin no. 661] whereabouts unknown. Based on Hydrocyon hepsetus of Jenyns 1840:129 [ref. 2344] (not of Cuvier). •Valid as Oligosarcus jenynsii (Günther 1864) -- (Menezes & Géry 1983:589 [ref. 8307], Menezes 1987:22 [ref. 20060], Malabarba 1989:137 [ref. 14217], Haro et al. 1996:6 [ref. 25004] as jenynsi, Gómez & Chebez 1996:47 [ref. 23791], Miquelarena et al. 1997:68 [ref. 23469], Butí & Cancino 1999:71 [ref. 25277], López et al. 2002:63 [ref. 26808] as jenynsi, Menezes in Reis et al. 2003:151 [ref. 27061], López et al. 2003:29 [ref. 27366], Casciotta et al. 2003:87 [ref. 28130], Menni 2004:74 [ref. 28131] as jenynsi, Ribeiro et al. 2007:52 [ref. 29321], Menezes & Ribeiro 2010:653 [ref. 30976], Mirande 2010:497 [ref. 31006] as cf. jenynsii, Mabragaña et al. 2011:table S2 [ref. 31800], Fabiano et al. 2014:8 [ref. 33530], Litz & Koerber 2014:15 [ref. 33622], Sarmiento et al. 2014:185 [ref. 35004], Almirón et al. 2015:589 [ref. 33673], Ribeiro & Menezes 2015:77 [ref. 33768], Menezes & Ribeiro 2015:545 [ref. 33973], Mirande & Koerber 2015:25 [ref. 35117], Bertaco et al. 2016:414 [ref. 34561], Petry et al. 2016:302 [ref. 34966], Nión et al. 2016:28 [ref. 35565] as jenynsi, Wendt et al. 2019:5 [ref. 36952], Koerber & Serra 2020:1 [ref. 37449], Reis et al. 2020:459 [ref. 38364], Giora & Wingert 2023:75 [ref. 41026], Loureiro et al. 2023:70 [ref. 40506]). Current status: Valid as Oligosarcus jenynsii (Günther 1864). Characidae: Stethaprioninae. Distribution: South America: coastal areas and interior plains of Rio Grande do Sul state and Paraná River basin (Argentina, Brazil, Bolivia and Uruguay). Habitat: freshwater.

pericoptes, Xiphorhamphus Müller [J.] & Troschel [F. H.] 1844:93 [Archiv für Naturgeschichte v. 10 (pt 1); ref. 3070] Brazil. No types known. Also in Müller & Troschel 1845:32, Pl. 5 [ref. 3071]. •Nomen dubium in genus Oligosarcus -- (Menezes 1987:32 [ref. 20060]). •Either a synonym of O. hepsetus or O. robustus -- (Menezes in Reis et al. 2003:152 [ref. 27061], Menezes & Camelier 2024:245 [ref. 40817]). •Questionably a synonym of Oligosarcus hepsetus (Cuvier 1829) -- (Litz & Koerber 2014:15 [ref. 33622], Mirande & Koerber 2015:25 [ref. 35117]). Nomen Dubium. Characidae: Stethaprioninae. Habitat: freshwater.