Taxonomic study of Hoplias aimara (Valenciennes, 1846) and Hoplias macrophthalmus (Pellegrin, 1907) (Ostariophysi, Characiformes, Erythrinidae) - Mattox, George Mendes Taliaferro; Toledo-Piza, Mônica; Oyakawa, Osvaldo Takeshi (Copeia, 2006)