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 Trichomycterus corduvensis Weyenbergh 1877 Material examined. 25 exemplars; 35.2 - 60.1 mm SL. CI FML 7811 , 4 ex, 27° 12’ 29.6”S , 65° 37’ 39.2”W Pueblo Viejo River . CI FML 7820 , 1 ex, 27° 12’ 29.6”S , 65° 37’ 39.2”W Pueblo Viejo River . CI FML 7830 , 1 ex, 27° 19’ 07.5”S , 65° 41’ 51.2”W Jaya River . CI FML 7836 , 2 ex, 27° 19’ 07.5”S , 65° 41’ 51.2”W Jaya River . CI FML 7838 , 1 ex, 27° 19’ 07.5”S , 65° 41’ 51.2”W Jaya River . CI FML 7839 , 2 ex, 27° 19’ 07.5”S , 65° 41’ 51.2”W Jaya River . CI FML 7848 , 2 ex, 27° 17’ 39.8”S , 65° 51’ 02.0”W Jaya River . CI FML 7889 , 1 ex, 27° 17’ 39.8”S , 65° 51’ 02.0”W Jaya River . CI FML 7920 , 1 ex, 27° 21’23.8” S , 65° 48’33.3”W Cochuna River . CI FML 7921 , 1 ex, 27° 12’ 29.6”S , 65° 37’ 39.2”W Pueblo Viejo River . CI FML 7932 , 8 ex, 27°12’ 36.21”S ; 65°37’ 22.80”W Pueblo Viejo River . CI FML 7935 , 1 ex, 27° 09’33.3” S 65° 42’ 37.6”W Pueblo Viejo River . Identification. Papillae-like structures present on body; round head shape in dorsal view; operculum and interoperculum with odontodes directed towards the posterior region; without mentonian barbels; caudal peduncle smoothly continuous with dorsal and ventral profiles of trunk; 13 principal caudal-fin rays with distal margin straight; without adipose fin; first ray of pectoral fins is non-prolonged, similar size to the rest of the fin rays; unpigmented region on the dorsal-fin origin absent ( Ringuelet et al., 1961 ; Fernández et al., 2007).