villarsi, Plecostomus Lütken [C. F.] 1874:211 [10] [Videnskabelige Meddelelser fra den Naturhistoriske Forening i Kjøbenhavn, Aaret 1873 (nos 13-14); ref. 2854] Caracas?, Venezuela. Syntypes: ZMUC P 30149 [ex 64] (1), P 30150 [ex 65] (stuffed). Type catalog: Nielsen 1974:52 [ref. 9588], Ferraris 2007:298 [ref. 29155]. On p. 10 of separate. •Valid as Hypostomus villarsi (Lütken 1874) -- (Isbrücker 1980:37 [ref. 2303], Burgess 1989:433 [ref. 12860], Armbruster 2004:80 [ref. 27644]). •Valid as Squaliforma villarsi (Lütken 1874) -- (Isbrücker et al. 2001:22 [ref. 25649], Isbrücker 2001:31, 32 [ref. 25653], Isbrücker 2002:29 [ref. 27178], Weber in Reis et al. 2003:368 [ref. 27061], Ferraris 2007:298 [ref. 29155], DoNascimiento 2016:533 [ref. 34727]). •Valid as Isorineloricaria villarsi (Lütken 1874) -- (Ray & Armbruster 2016:534 [ref. 34178], DoNascimiento et al. 2017:82 [ref. 35633]). Current status: Valid as Isorineloricaria villarsi (Lütken 1874). Loricariidae: Hypostominae. Distribution: Maracaibo River basin: Venezuela and Colombia. Habitat: freshwater.