The new genus Repandocosta is described for twelve North American and at least three European ostracode species that have been placed mainly in Trachyleberidea or Cythereis. Cythereis pauca Schmidt, 1948, is designated as the type species. The new genus has a stratigraphic range in North America of Coniacian [Cretaceous] to upper Eocene; in Europe it is known from middle Paleocene to upper Oligocene.

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