Classification of crucigenoid algae: phylogenetic position of the reinstated genus Lemmermannia,Tetrastrum spp. Crucigenia tetrapedia,and C. lauterbornii (Trebouxiophyceae,Chlorophyta)1 |
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Authors: | Christina Bock Wei Luo Wolf‐Henning Kusber Eberhard Hegewald Marie Pažoutová Lothar Krienitz |
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Institution: | 1. Department of General Botany, Faculty of Biology, University Duisburg‐Essen, , Essen, D‐45141 Germany;2. Department of Limnology of Stratified Lakes, Leibniz‐Institute of Freshwater Ecology and Inland Fisheries, , Stechlin‐Neuglobsow, D‐16775 Germany;3. SOA Key Laboratory for Polar Science, Polar Research Institute of China, , Shanghai, 200136 China;4. Botanic Garden and Botanical Museum Berlin‐Dahlem, Freie Universit?t Berlin, , Berlin, 14195 Germany;5. Grüner Weg, , Niederzier, D‐52382 Germany;6. Department of Botany, Faculty of Science, University of South Bohemia, , Ceske Budejovice, 37005 Czech Republic |
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Abstract: | The subfamily Crucigenioideae was traditionally classified within the well‐characterized family Scenedesmaceae (Chlorophyceae). Several morpho‐logical revisions and questionable taxonomic changes hampered the correct classification of crucigenoid species resulting in a high number of synonymous genera. We used a molecular approach to determine the phylogenetic position of several Tetrastrum and Crucigenia species. The molecular results were correlated with morphological and ontogenetic characters. Phylogenetic analyses of the SSU rDNA gene resolved the position of Tetrastrum heteracanthum and T. staurogeniaeforme as a new lineage within the Oocystis clade of the Trebouxiophyceae. Crucigenia tetrapedia, T. triangulare, T. punctatum, and T. komarekii were shown to be closely related to Botryococcus (Trebouxiophyceae) and were transferred to Lemmer‐mannia. Crucigenia lauterbornii was not closely related to the other Crucigenia strains, but was recovered within the Chlorella clade of the Trebouxiophyceae. |
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Keywords: |
Chlorella
Crucigenia
ITS
Lemmermannia
phylogeny Scenedesmaceae
SSU
taxonomy
Tetrastrum
Trebouxiophyceae |
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