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Work cat.: (OSt)238580: Gravena, W., Ocurrence of B Chromosomes in Cyphocharax Modestus - Fernández-Yépez, 1948 - and Steindachnerina Insculpta - Fernández-Yépez, 1948 - - Characiformes, Curimatidae - From the Tibagi River Basin - Paraná State, Brazil - / W. Gravena ...[et Al.]