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 Acrobrycon tarijae Fowler 1940 Material examined. 83 exemplars; 49.2 - 74.2 mm SL. CI FML 7814 , 2 ex, 27° 12’ 29.6”S , 65° 37’ 39.2”W Pueblo Viejo River . CI FML 7817 , 5 ex, 27° 12’ 29.6”S , 65° 37’ 39.2”W Pueblo Viejo River . CI FML 7833 , 10 ex, 27° 19’ 07.5”S , 65° 41’ 51.2”W , Jaya River . CI FML 7840 , 5 ex, 27° 19’ 07.5”S , 65° 41’ 51.2”W Jaya River . CI FML 7845 , 4 ex, 27° 19’ 07.5”S , 65° 41’ 51.2”W Jaya River . CI FML 7846 , 8 ex, 27° 17’ 39.8”S , 65° 51’ 02.0”W Jaya River . CI FML 7858 , 12 ex, 27° 19’ 07.5”S , 65° 41’ 51.2”W Jaya River . CI FML 7884 , 2 ex, 27° 19’ 07.5”S , 65° 41’ 51.2”W Jaya River . CI FML 7914 , 8 ex, 27° 21’ 23.8” S , 65° 48’ 33.3”W Cochuna River . CI FML 7917 , 12 ex, 27°21’23.8” S , 65° 48’33.3”W Cochuna River . CI FML 7934 , 15 ex, 27° 09’33.3” S 65°42’ 37.6”W Pueblo Viejo River . Figure 3. Characiformes : A. Acrobrycon tarijae CI FML 7917, 60.3 mm SL. B. Astyanax abramis CI FML 7887, 86.7 mm SL. C. Astyanax lacustris CI FML 7928, 53.5 mm SL. D. Bryconamericus iheringii CI FML 7832, 52.7 mm SL. E. Odontostilbe microcephala CI FML 7885, 48.8 mm SL. F. Oligosarcus jenynsii CI-FML 7831, 53.7 mm SL. G. Psalidodon puka CI FML 7931, 51.2 mm SL. H. Characidium borellii CI FML 7924, 42.1 mm SL. Figura 3. Characiformes : A. Acrobrycon tarijae CI FML 7917, 60,3 mm SL. B. Astyanax abramis CI FML 7887, 86,7 mm SL. C. Astyanax lacustris CI FML 7928, 53,5 mm SL. D. Bryconamericus iheringii CI FML 7832, 52,7 mm SL. E. Odontostilbe microcephala CI FML 7885, 48,8 mm SL. F. Oligosarcus jenynsii CI-FML 7831, 53,7 mm SL. G. Psalidodon puka CI FML 7931, 51,2 mm SL. H. Characidium borellii CI FML 7924, 42,1 mm SL. Identification. Number of perforated scales of the lateral line: 51-60; number of horizontal-scale rows around the caudal peduncle: 19-21; lower number of vertebrae (37-39); and pleural ribs: 12-13 pairs; number of branched anal-fin rays: 23-27; presence of a glandular pocket at the base of the lower lobe of the caudal fin in males; orange adipose fin ( Briñoccoli et al., 2022 ).