Abstract
A correlation between the charophyte index-species Raskyella peckii and the biozonation of larger foraminifera (Shallow Benthic Zones SBZ 13 and SBZ 18) is proposed, which results in a widening to about 6 MA of the present known chronostratigraphic range of the charophyte species. The new range is Early Lutetian to Late Bartonian. This leads to a significant modification in charophyte biozonation including a redefinition of the charophyte biozone of Raskyella peckii as a partial range zone and the elimination of the biozone of Maedleriella embergeri (Early Lutetian). In addition, the new chronostratigraphic range of Raskyella peckii overlaps the range of the related species Raskyella vadaszi, covering the gap which separated both species. Gaps in the fossil record of Raskyellaceae gave rise to the hypothesis of a polyphyletic origin for this fossil family. The new, continuous chronostratigraphic range suggests that at least the genus Raskyella appears to be monophyletic and did not originate from different characean ancestors.
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