alternans, Ancistrus multiradiatus var. Regan [C. T.] 1904:229 [Transactions of the Zoological Society of London v. 17 (pt 3, no. 1); ref. 3621] Paraguayan Chaco, Drainage of Río Paraguay in region of Vila Conceptión, Paraguay. Lectotype: BMNH 1898.7.4.5. Paralectotypes: BMNH 1898.6.3.30-31 (2). Type catalog: Ferraris 2007:291 [ref. 29155]. Lectotype selected by Weber 1992:28 [ref. 19714]. •Valid as Pterygoplichthys alternans (Regan 1904) -- (Isbrücker 1980:40 [ref. 2303], Burgess 1989:433 [ref. 12860]). •Synonym of Liposarcus ambrosetti Holmberg 1893 -- (Isbrücker 2001:25 [ref. 25653], Isbrücker 2002:12 [ref. 27178]). •Synonym of Liposarcus anisitsi (Eigenmann & Kennedy 1903) -- (Weber 1992:28 [ref. 19714], Weber in Reis et al. 2003:365 [ref. 27061]). •Synonym of Pterygoplichthys ambrosettii (Holmberg 1893) -- (Ferraris 2007:291 [ref. 29155], Litz & Koerber 2014:26 [ref. 33622], Mirande & Koerber 2015:43 [ref. 35117], Koerber et al. 2017:63 [ref. 35267]). Current status: Synonym of Pterygoplichthys ambrosettii (Holmberg 1893). Loricariidae: Hypostominae. Habitat: freshwater.