A new species of Astyanax (Characiformes, Characidae) from the upper río Bermejo basin

MIRANDE, JUAN MARCOS; AGUILERA, GASTÓN; AZPELICUETA, MARÍA DE LAS MERCEDES

REVUE SUISSE DE ZOOLOGIE

Musée de Histoire Naturelle de Genéve

Lugar: Ginebra, Suiza; Año: 2004 vol. 111 p. 213 - 223

0035-418X

Astyanax latens sp. n.,from the Bermejo river basin, is described in this paper. Astyanax latens is diagnosed by a combination of characters: somewhat rhomboidal body; presence of 24-29 branched anal fin rays; 1-4maxillary teeth; long pectoral fins (23.2-26.6%of SL) always reaching one third of pelvic fin; long pelvic fins (17.6-22.0 % of SL) always surpassing anal fin origin; anal fin base long (32.3-36.7 % of SL); 26-27 gill rakers on first branchial arch; lateral band extremely narrow; one large vertically elongated humeral spot and a second one very faint; relatively shallow caudal peduncle (10.0-11.4 % SL); fifth tooth of inner premaxillary series very small and scarcely posterior to main series; origin of anal fin below dorsal fin