Ichthyofauna of the lower course of the Negro river drainage, Patagonia Argentina Author Soricetti, Mariano Author Morawicki, Santiago Author Guardiola Rivas, Fredy José Author Guidi, Catalina Author Quezada, Facundo Author Almirón, Adriana Edith Author Solimano, Patricio José text Check List 2020 2020-07-24 16 4 895 905 http://dx.doi.org/10.15560/16.4.895 journal article 10.15560/16.4.895 1809-127X Genidens barbus (Lacepède, 1803) Figure 3L Material examined. ARGENTINA • 1 ♀ , 320 mm ; Site 6; 40°48ʹ10ʺS , 062°59ʹ36ʺW ; 25 Feb. 2016 ; B. Rodriguez leg.; MPCN-Ict 13 . • 1 ♀ , 343 mm ; Site 6; 40°48ʹ10ʺS , 062°59ʹ36ʺW ; 24 Nov. 2016 ; B. Rodriguez leg.; MPCN- Ict 82 . • 1 ♂ , 351 mm ; Site 6; 40°48ʹ10ʺS ; 062°59ʹ36ʺW , 13 Dec. 2016 ; M. Soricetti leg.; MPCN-Ict 83 . • 1 ♀ , 364 mm ; Site 6; 40°48ʹ10ʺS ; 062°59ʹ36ʺW , 30 Nov. 2017 ; M. Soricetti leg.; MPCN-Ict 84 . • 1 ♀ , 372 mm ; Site 6; 40°48ʹ10ʺS , 062°59ʹ36ʺW ; 25 Feb. 2016 ; B. Rodriguez leg.; MPCN-Ict 85 . Identification. Body robust and elongated. The anterior frontal fontanelle reaches close to the base of the postoccipital process like a narrow groove. Upper jaw projected and lips thick. Maxillary barbels reaches the end of the operculum; the shortest mental and postmental barbels are inserted parallel to the edge of the jaw. Adipose fin, short. Pectoral-fin spine similar in length to dorsal-fin spine, with toothed internal edge. Caudal fin forked, with upper lobe narrower and longer than lower lobe. Anal fin emarginated. Uniform gray–black color, with purple reflections.