piriformis, Ancistrus Muller [S.] 1989:887, Fig. 1 [Revue Suisse de Zoologie v. 96 (no. 4); ref. 13512] Río Acaray, above the lake behind the dam, 25°23'S, 54°42'W, Alto Paraná, Paraguay. Holotype: MHNG 2450.11. Paratypes: (103) CFA-IC 10698 [ex ILPLA 698, ex MHNG 2268.58] (3); MHNG 2160.25 (1), 2268.20 (1), 2268.58-59 (?); MCP (2); USNM 307766 (2); ZFMK 16279-80 (2); ZMA 120328 (5); ZSM 27593 (2). Type catalog: Ferraris & Vari 1992:25 [ref. 19771], Weber 1998:9 [ref. 32707], Ferraris 2007:224 [ref. 29155], Herder et al. 2010:121 [ref. 31087], Neumann 2011:262 [ref. 31652], Bogan et al. 2019:17 [ref. 37088]. •Valid as Ancistrus piriformis Muller 1989 -- (Burgess & Finley 1996:170 [ref. 22901], Muller 1990 [ref. 14539], Miquelarena et al. 1997:70 [ref. 23469], Isbrücker 2001:25 [ref. 25653], Isbrücker 2002:12 [ref. 27178], Fisch-Muller in Reis et al. 2003:378 [ref. 27061], López et al. 2003:53 [ref. 27366], Menni 2004:81 [ref. 28131], Ferraris 2007:224 [ref. 29155], Bifi et al. 2009:41 [ref. 30541], Mirande & Koerber 2015:41 [ref. 35117], Koerber et al. 2017:60 [ref. 35267]). Current status: Valid as Ancistrus piriformis Muller 1989. Loricariidae: Hypostominae. Distribution: South America: Acaray River basin in middle Paraná River drainage and upper Paraná River basin (Argentina and Paraguay). Habitat: freshwater.