Cnesterodon decemmaculatus (Jenyns, 1842)

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 : 901

Cnesterodon decemmaculatus (Jenyns, 1842)

Figure 3G

Material examined. ARGENTINA • 1 ♀, 36 mm; Site 2; 40°42ʹ48ʺS, 063°23ʹ08ʺW; 22 Nov. 2016; M. Sorice- tti leg.; MPCN-Ict 7 . • 1 ♀, 22 mm; Site 5; 40°49ʹ26ʺS, 063°09ʹ51ʺW; 20 Feb. 2016; M. Soricetti leg.; MPCN- Ict 56 . • 1 ♂, 25 mm; Site 2; 40°42ʹ48ʺS, 063°23ʹ08ʺW; 13 Dec. 2016; B. Rodriguez leg.; MPCN-Ict 57 . • 1 ♀, 26 mm; Site 5; 40°49ʹ26ʺS, 063°09ʹ51ʺW; 20 Feb. 2016; F. Guardiola Rivas leg.; MPCN-Ict 58 . • 1 ♂, 29 mm; Site 3; 40°43ʹ30ʺS, 063°14ʹ02ʺW; 23 Apr. 2016; P. Solimano leg.; MPCN-Ict 59 . • 1 ♀, 30 mm; Site 3; 40°43ʹ30ʺS, 063°14ʹ02ʺW; 23 Apr. 2016; M. Soricetti leg.; MPCN-Ict 60 . • 1 ♀, 31 mm; Site 2; 40°42ʹ48ʺS, 063°23ʹ08ʺW; 24 Apr. 2017; M. Soricetti leg.; MPCN- Ict 61 . • 1 ♂, 31 mm; Site 5; 40°49ʹ26ʺS, 063°09ʹ51ʺW; 20 Feb. 2016; F. Guardiola Rivas leg.; MPCN-Ict 62 . • 1 ♂, 32 mm; Site 3; 40°43ʹ30ʺS, 063°14ʹ02ʺW; 23 Apr. 2016; M. Soricetti leg.; MPCN-Ict 63 . • 1 ♀, 33 mm; Site 5; 40°49ʹ26ʺS; 063°09ʹ51ʺW; 20 Feb. 2016; F. Guardiola Ri- vas leg.; MPCN-Ict 64 . • 1 ♂, 37 mm; Site 3; 40°43ʹ30ʺS, 063°14ʹ02ʺW; 23 Apr. 2016; P. Solimano leg.; MPCN-Ict 65 .

Identification. Small, body subcylindrical. Snout acute. Lower jaw slightly longer than upper jaw. Longitudinal series with 31–33 scales. Anal-fin rays of males modi- fied forming a gonopodium. Adult males gonopodium with a bony style long and slightly arched, covered by a membrane that ends in a distal filament. Grayish back- ground color with dark bars, regularly spaced and restricted to the midline, along the sides of the body.