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Title
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Revision of European Brachysira species (Brachysiraceae, Bacillariophyta) : IV. the Brachysira vitrea group
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Author
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Abstract
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| This fourth paper revising the European Brachysira species deals with the complex of species and populations identified as Brachysira vitrea and Brachysira hofmanniae. The morphology of these species is characterised in detail based on a combination of analyses of original type material and additional historic and modern samples. The analysis of the type material of B. vitrea clearly showed that this apparently highly variable species should be divided into several distinct species, described as new: Brachysira ellipticovitrea, B. vitreoides and B. paraexilis. All new species can be separated, both in LM and SEM, based on valve outline, shape of the apices, morphometric differences and structure of the areolae and spine ornamentation. The related B. hofmanniae group also contains several species, as shown by the type material analysis. Brachysira pseudovitrea has a very dense pattern of small spines on the virgae and an elongated, clearly heteropolar valve outline. Brachysira hamiltoniana is characterised by a very large marginal ridge and enlarged longitudinal axial ridges in the axial area, covering the valve face almost entirely. Finally, B. ectoriana has a typical areola pattern in the central area and a large marginal ridge, partly covering the valve margins. The ecological preferences of all the reported taxa is derived from the accompanying diatom flora in the investigated samples and from measured physico chemical parameters. All taxa in this complex are typically found in oligotrophic, more or less alkaline environments. |
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Language
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English
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Source (journal)
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Nova Hedwigia: Zeitschrift für Kryptogamenkunde. - Berlin
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Publication
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Stuttgart
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Gebruder borntraeger
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2023
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ISSN
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0029-5035
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DOI
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10.1127/NOVA_HEDWIGIA/2023/0839
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Volume/pages
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117
:1-4
(2023)
, p. 279-318
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ISI
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001058140500001
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Full text (Publisher's DOI)
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Full text (open access)
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