Who’s behind those red eyes? The Moenkhausia oligolepis group in Argentina (Characiformes: Characidae). Author Mirande, Juan Marcos Fundación Miguel Lillo - UEL (CONICET-FML), Miguel Lillo 251, 4000 San Miguel de Tucumán, Argentina mcmirande@gmail.com Author Koerber, Stefan Independent researcher. Friesenstr. 11, 45476 Muelheim, Germany Author Terán, Guillermo E. Fundación Miguel Lillo - UEL (CONICET-FML), Miguel Lillo 251, 4000 San Miguel de Tucumán, Argentina Author Aguilera, Gastón text Ichthyological Contributions of PecesCriollos 2020 2020-04-15 66 1 7 journal article 298602 10.5281/zenodo.11558370 17088fae-700e-4f52-833f-c1d62ece1b8f 1868-3703 11558370 Moenkhausia sanctae filomenae (Steindachner) One male of 41, one female of 46 mm total length. Height 2.6-2.5; head 3.5-3.7; eye 2.8-2.7. Interorbital distance only slightly bigger than eye diameter. D 10; A 25-26; in one longitudinal row 26 scales, between dorsal and pelvic fins 10 scales. The lateral line perforates 9 or 10 scales. Coloration yellowish-grey-olive, the belly more yellowish, in the male silver, in this [the male] also the body shiny silver. Edges of scales darker, the scales with fine radii. On the caudal peduncle from the end of the adipose fin a pale yellow, in the living animal a metallic bright zone, followed by a dark brown swathe of equal width, which extends to the caudal fin. First rays of anal fin with a fine dark line. All other fins colorless.