Journal
NEOTROPICAL ICHTHYOLOGY
Volume 6, Issue 2, Pages 169-174Publisher
SOC BRASILEIRA ICTIOLOGIA
DOI: 10.1590/S1679-62252008000200003
Keywords
characidiinae; South American darters; upper rio Parana; upper rio Tocantins; taxonomy; sexual fin-hooks
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Characidium xanthopterum is described from tributaries of the upper rio Parana and upper rio Tocantins basins, in the Central Brazilian Plateau, Goias State, Brazil. The new species is diagnosed among congeners by the absence of dark bars on the sides of the body in adult specimens, and by the deep yellow coloration in all fins. Ontogenetic change of color pattern is recorded for the first time for Characidium species. Specimens smaller than 32 mm SL possess dark bars on body. These bars disappear with growth between 32 and 35 mm SL, and are always absent in individuals larger than 35 mm SL.
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