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 Psalidodon puka ( Mirande, Aguilera & Azpelicueta 2007 ) Material examined. 68 exemplars; 38.3 - 56.3 mm SL. CI FML 7931 , 68 ex, 27° 12’ 36.21”S ; 65° 37’ 22.80”W Pueblo Viejo River . Identification. Shallow body (33.5-39.8% of SL); short distance between pelvic and anal-fin origins (17.1-20.6 % SL); long caudal peduncle (13.3-16.5 % SL); 36-38 perforated scales in lateral line; 6-5 transverse scales; presence of two series of teeth in the premaxilla with 5 teeth in the inner series; 9-10 gradually decreasing dentary teeth; distally expanded premaxillary teeth; one distally expanded maxillary tooth with 7–9 cusps; short upper jaw length (34.5-37.8 % HL), short maxilla (20.7-23.3 % HL) expanded abruptly under maxillary tooth position; short postorbital distance (36.6–46.9 % HL); dorsal fin with 9 branched rays; 22–27 branched anal-fin rays; vertical or diffuse humeral spot ( Mirande et al., 2007 ).