Heptapterus qenqo Aguilera, Mirande & Azpelicueta 2011

Material examined. 11 exemplars; 39.5 - 252.2 mm SL. CI FML 7813, 1 ex, 27° 12’ 29.6”S, 65° 37’ 39.2”W Pueblo Viejo River. CI FML 7851, 1 ex, 27° 17’ 39.8”S, 65° 51’ 02.0”W Jaya River. CI FML 7856, 3 ex, 27° 17’ 39.8”S, 65° 51’ 02.0”W Jaya River. CI FML 7907, 2 ex, 27° 12’ 29.6”S, 65° 37’ 39.2”W Pueblo Viejo River. CI FML 7912, 3 ex, 27° 19’27.29 “S, 65° 53’20.28 “W Cochuna River. CI FML 7926, 1 ex, 27°12’ 36.21”S; 65°37’ 22.80”W Pueblo Viejo River .

Identification. Very elongate (eel-like) body form; small eyes (7,4–14,2% of the head length); maxillary barbels do not reach pectoral-fin base in adults and reach or scarcely surpass first pectoral-fin ray in small juveniles; adipose fin is attached to the caudal fin; without a pectoral spine; presence of small serrae on the anterior proximal margin of the first pectoral-fin ray; anal-fin rays iv-v, 11-13 (15–17 total anal-fin rays); adipose-fin base 40,9-47,4% of the SL (Aguilera et al., 2011).