Abstract
Astyanax laticeps (Teleostei: Characiformes: Characidae) from rivers and streams of Uruguay. – Astyanax laticeps is recorded from different streams of Laguna Merín, Laguna Castillos and Laguna de Rocha basins (Uruguay). The species is recognized by low body (28.2-37.3 % of SL), blunt snout, 1–4 maxillary teeth, 18–24 branched anal-fin rays, 36–39 perforated scales in lateral line, short caudal peduncle (12.6–13.7 % of SL), dorsal-fin origin nearer snout than caudal-fin rays origin, a horizontally oval or rounded humeral spot, surrounded by a light area, mature males with bony hooks on branched pelvic-fin rays and anteriormost anal-fins rays.
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