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New species of glass knifefish genus Eigenmannia (Gymnotiformes: Sternopygidae) with comments on the morphology and function of the enlarged cephalic lateral-line canals of Sternopygidae.

A new species of Eigenmannia is described from the Rio Paraná (the Grande, Paranapanema, and Tietê basins) in the State of São Paulo, and marginally in the State of Minas Gerais, Brazil. The new species is distinguished from all congeners by coloration pattern, position of the mouth, relative depth of posterodorsal expansion on infraorbitals 1+2, number of teeth, osteological features, number of scales rows above lateral line, and morphometric data. Comments on the widened cephalic lateral-line canals of Sternopygidae and a dichotomous key to the species of Eigenmannia from the Rio Paraná Basin are provided.