acipenserinus, Hemiodon Kner [R.] 1853:92 [28], Pl. 7 (fig. 2a-c) [Denkschriften der Kaiserlichen Akademie der Wissenschaften in Wien, Mathematisch-Naturwissenschaftliche Classe. v. 6; ref. 2627] Rio Guaporé, Rondônia, Brazil. Lectotype: NMW 46139. Paralectotypes: ZMA 112957 (1); NMW 46138 (1), 46140 (1), 74914 (1, not found in 1995). Type catalog: Isbrücker & Nijssen 1974:204 [ref. 7126]. On p. 28 of separate. Lectotype selected by Isbrücker & Nijssen 1974:204 [ref. 7126]. •Valid as Hemiodontichthys acipenserinus (Kner 1853) -- (Isbrücker 1980:130 [ref. 2303], Ortega & Vari 1986:17 [ref. 9708], Burgess 1989:445 [ref. 12860], Montoya-Burgos et al. 1998:367 [ref. 23850], Britski et al. 1999:129 [ref. 24147], Le Bail et al. 2000:278 [ref. 24549], Isbrücker 2001:28 [ref. 25653], Isbrücker 2002:17 [ref. 27178], Ferraris in Reis et al. 2003:336 [ref. 27061], Barriga Salazar 2014:112 [ref. 35745], Sarmiento et al. 2014:191 [ref. 35004], DoNascimiento et al. 2017:78 [ref. 35633], Silvano et al. 2020:251 [ref. 38135], Meza-Vargas et al. 2021:25 [ref. 39298], Koerber et al. 2022:48 [ref. 39235], Taphorn et al. 2022:51 [ref. 41297], Vieira et al. 2023:20 [ref. 40759], Limeira-Filho et al. 2024:7 [ref. 41573]). Current status: Valid as Hemiodontichthys acipenserinus (Kner 1853). Loricariidae: Loricariinae. Distribution: South America: Rio Madeira drainage, Amazon River basin; Essequibo, Paraguay and Oiapoque River drainages, and coastal rivers of northern Brazil (Bolivia, Brazil, Ecuador, Colombia, French Guiana, Guyana and Peru). IUCN (2023): Least Concern. Habitat: freshwater.