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New Frustulia species (Bacillariophyceae) from fossil freshwater deposits in Florida, U.S.A.

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Two new fossil species - Frustulia floridana and F. sanctaerosae - and an emended diagnosis of F. disjuncta Lange-Bertalot illustrate that sufficiently precise taxonomic criteria are required if a realistic insight into the species diversity in Frustulia is to be obtained. These species have probably been observed before but identified as Frustulia rhomboides (Ehrenberg) De Toni, in the light of the previously excessively broad species concept, which was erroneously based on Navicula rhomboides Ehrenberg.

Zwei neue fossile Frustulia Arten - F. floridana und F. sanctaerosae - sowie Emendierung der Diagnose von F.disjuncta Lange-Bertalot zeigen, dass die Anwendung genügend präziser taxonomischer Merkmale notwendig ist, bevor sich ein realistisches Bild der SpeziesDiversität in dieser Gattung entwickeln lässt. Es ist wahrscheinlich, dass diese Arten schon früher von anderen Autoren beobachtet, jedoch nach dem damals viel zu weiten und auch noch falschen Konzept des Ehrenberg-Taxons als Frustulia rhomboides (Ehrenberg) De Toni bestimmt worden sind.
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Document Type: Research Article

Publication date: May 1, 2004

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  • Nova Hedwigia is an international journal publishing original, peer-reviewed papers on current issues of taxonomy, morphology, ultrastructure and ecology of all groups of cryptogamic plants, including cyanophytes/cyanobacteria and fungi. The half-tone plates in Nova Hedwigia are known for their high quality, which makes them especially suitable for the reproduction of photomicrographs and scanning and transmission electron micrographs.
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