Four species of Characiformes (<i>Astyanax eigenmanniorum, Characidium rachowi, Curimatopsis saladensis</i> and <i>Pseudocurimata nitens</i>) and five species of Siluriformes (<i>Hypophthalmus edentatus, Megalodoras laevigatulus, Homodiaetus maculatus, Cataphractos melampterus</i> and <i>Hoplosternum thoracatum thoracatum</i>) are recorded from ten new Argentine localities. New distributional data are discussed. Relevant morphological measurements and some comments are added.Contribución científica Nº 134 del Instituto de Limnología (ILPLA).Facultad de Ciencias Naturales y Museo