spinosissimus, Plecostomus Steindachner [F.] 1880:98 [46], Pl. 5 (figs. 1-1a) [Denkschriften der Kaiserlichen Akademie der Wissenschaften in Wien, Mathematisch-Naturwissenschaftliche Classe. v. 42; ref. 14403] Guayaquil, Ecuador. Holotype (unique): NMW 55027. Type catalog: Ferraris 2007:263 [ref. 29155]. On p. 46 of separate. •Valid as Plecostomus spinosissimus Steindachner 1880 -- (Ovchynnyk 1967:40 [ref. 37559]). •Valid as Hypostomus spinosissimus (Steindachner 1880) -- (Armbruster 2004:80 [ref. 27644]). •Valid as Isorineloricaria spinosissima (Steindachner 1880) -- (Isbrücker 1980:17 [ref. 2303], Burgess 1989:430 [ref. 12860], Montoya-Burgos et al. 1998:367 [ref. 23850], Isbrücker 2001:28, 31 [ref. 25653], Isbrücker 2002:20 [ref. 27178], Weber in Reis et al. 2003:364 [ref. 27061], Ferraris 2007:262 [ref. 29155], Barriga Salazar 2014:113 [ref. 35745], Jiménez-Prado et al. 2015:229 [ref. 34894], Ray & Armbruster 2016:530 [ref. 34178]). Current status: Valid as Isorineloricaria spinosissima (Steindachner 1880). Loricariidae: Hypostominae. Distribution: South America: Guayas River basin (Ecuador). Habitat: freshwater.