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Diapoma nandi is described from the Piray‐Miní stream, a tributary of the Rio Paraná in Argentina. It is characterized among the Stevardiinae by having a terminal mouth, two unbranched and eight branched dorsal‐fin rays, one unbranched and six branched pelvic‐fin rays and the absence of a caudal‐fin organ and is distinguished from all congeners by the following combination of characters: unmodified...
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