riojanum, Pygidium Berg [C.] 1897:269 [Anales del Museo Nacional de Historia Natural de Buenos Aires v. 5; ref. 14623] Arroyo of the Cordillera de la Province de La Rioja, Argentina. Holotype (unique): MACN 5175 (destroyed). Type catalog: Braga & Piacentino 1994:105 [ref. 23697], Ferraris 2007:422 [ref. 29155]. Gender of species needs research. •Status uncertain -- (Fernádez & Schaefer 2003:357 [ref. 27407], Menni 2004:82 [ref. 28131]). •Valid as Trichomycterus riojanus (Berg 1897) -- (Burgess 1989:323 [ref. 12860] as riojanum, Fernández 2000:32 [ref. 26195] as riojanum, Miquelarena & Fernández 2000:44 [ref. 27633], López et al. 2002:60 [ref. 26808], de Pinna & Wosiacki in Reis et al. 2003:283 [ref. 27061], López et al. 2003:40 [ref. 27366], Ferraris 2007:422 [ref. 29155], Fernández & Vari 2009:198 [ref. 30062], Mirande & Koerber 2015:38 [ref. 35117]). Current status: Valid as Trichomycterus riojanus (Berg 1897). Trichomycteridae: Trichomycterinae. Distribution: La Rioja Range, Argentina. Habitat: freshwater.