Do we know what we are conserving? Fishes from Parque Nacional Aconquija, Tucumán, Northwestern Argentina Author Saravia, Alejandro Nicolás Author Mettola, Víctor Ezequiel Author Aguilera, Gastón Author Cano, Paula Daniela Author Terán, Guillermo Enrique text Acta Zoológica Lilloana 2023 2023-12-07 67 2 327 347 http://dx.doi.org/10.30550/j.azl/1804 journal article 299024 10.30550/j.azl/1804 23b81975-ae39-472d-828b-baaac3cb0956 1852-6098 11645144 Rineloricaria catamarcensis (Berg 1895) Material examined. 7 exemplars; 51.7 - 76.7 mm SL. CI FML 7834 , 1 ex, 27° 19’ 07.5”S , 65° 41’ 51.2”W Jaya River . CI FML 7923 , 6 ex, 27°12’ 36.21”S ; 65°37’ 22.80”W Pueblo Viejo River . Identification. Body and caudal peduncle greatly depressed; pointed snout; depressed caudal peduncle; abdomen completely covered by plates, but not forming regular series; dorsal margin of orbit markedly elevated; triangular and well-developed postorbital notch; undivided lips with short barbels; without adipose fin; pectoral fin barely surpasses ventral-fin origin; pectoral spines similar to the first pectoral ray; upper caudal-fin ray prolonged into a filament (Alcaraz et al., 2011; Liotta, 2016 ).