nigripinnis, Tetragonopterus Perugia [A.] 1891:643 [43] [Annali del Museo Civico di Storia Naturale di Genova (Serie 2) v. 10; ref. 3431] Río de la Plata, South America. Syntypes: MSNG 9222 (3), NMW 57 677 (1). Type catalog: Tortonese 1961:183 [ref. 10343]. On p. 43 of separate. •Valid as Markiana nigripinnis (Perugia 1891) -- (Taphorn 1992:248 [ref. 23654], Britski et al. 1999:30 [ref. 24147], Zarske & Géry 2002:19 [ref. 26554], Pavanelli in Reis et al. 2003:144 [ref. 27061], López et al. 2003:28 [ref. 27366], Menni 2004:78 [ref. 28131], Mirande 2010:518 [ref. 31006], Baicere-Silva et al. 2011:372 [ref. 31394], Litz & Koerber 2014:14 [ref. 33622], Sarmiento et al. 2014:185 [ref. 35004], Carvalho & Santos 2015:146 [ref. 33957], Thomaz et al. 2015:Add. 5 [ref. 33893], Mirande & Koerber 2015:24 [ref. 35117], Koerber et al. 2015:2 [ref. 35179], Koerber & Litz 2016:2 [ref. 35098], Nión et al. 2016:30 [ref. 35565], Koerber et al. 2017:3 [ref. 35083], Koerber et al. 2017:35 [ref. 35267], Koerber et al. 2017:4 [ref. 35632], Koerber et al. 2019:4 [ref. 36736], Koerber et al. 2020:4 [ref. 37480], Koerber et al. 2021:4 [ref. 38894], Monteiro et al. 2022:[5] [ref. 39227], Koerber et al. 2023:4 [ref. 40355]). Current status: Valid as Markiana nigripinnis (Perugia 1891). Stevardiidae: Landoninae. Distribution: South America: Paraná, Paraguay and Mamoré River basins (Argentina, Bolivia, Brazil, Paraguay and Uruguay). Habitat: freshwater.