Odontesthes hatcheri (Eigenmann, 1909)

Soricetti, Mariano, Morawicki, Santiago, Guardiola Rivas, Fredy José, Guidi, Catalina, Quezada, Facundo, Almirón, Adriana Edith & Solimano, Patricio José, 2020, Ichthyofauna of the lower course of the Negro river drainage, Patagonia Argentina, Check List 16 (4), pp. 895-905 : 898

Odontesthes hatcheri (Eigenmann, 1909)

Figure 3B

Material examined. ARGENTINA • 1 ♂, 98 mm; Site 1; 40°26ʹ18ʺS, 063°40ʹ54ʺW; 23 Nov. 2016; P. Solimano leg.; MPCN-Ict 2 . • 1 ♀, 136 mm; Site 1; 40°26ʹ18ʺS, 063°40ʹ54ʺW; 23 Nov. 2016; P. Solimano leg.; MPCN- Ict 19 . • 1 ♂, 152 mm; Site 1; 40°26ʹ18ʺS, 063°40ʹ54ʺW; 23 Nov. 2016; M. Soricetti leg.; MPCN-Ict 20 . • 1 ♂, 212 mm; Site 4; 40°43ʹ15ʺS, 063°36ʹ02ʺW; 28 May. 2016; P. Solimano leg.; MPCN-Ict 21 . • 1 ♀, 258 mm; Site 4; 40°43ʹ15ʺS, 063°36ʹ02ʺW; 23 May. 2017; P. Solimano leg.; MPCN-Ict 22 . • 1 ♀, 283 mm; Site 4; 40°43ʹ15ʺS, 063°36ʹ02ʺW; 23 May. 2017; M. Soricetti leg.; MPCN-Ict 23 . • 1 ♀, 307 mm; Site 4; 40°43ʹ15ʺS, 063°36ʹ02ʺW; 28 Jun. 2017; P. Solimano leg.; MPCN-Ict 24 .

Identification. Body elongated. Adults with the upper jaw prognathous, premaxilla protractil anteroven- trally and strong pharyngeal jaws with molariform teeth. Operculum with fenestrated inner face and convex pos- terodorsal edge. Dorsal edge of operculum continuing on the laminar ridge of dorsal operculum process. Three or more rows of teeth in the oral jaws; no teeth in vomer; 21–25 gill rakers on the lower branch. First dorsal fin co- incident with the posterior end of the pelvic fins; six or more interdorsal bones in continuous series. Small body scales (15 dorsal scales) with smooth posterior border. Three rows of subocular scales; scales also present on the interoperculum and between the anterior rays of the anal fin, but absent in the second dorsal fin. Posterior margin of body scales lined with a row of melanophores giving a very dark appearance to the specimens.