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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
SSU rRNA Phylogeny of Arcellinida (Amoebozoa) Reveals that the Largest Arcellinid Genus, Difflugia Leclerc 1815, is not Monophyletic
Protist, Volume 163, No. 3, Year 2012
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Description
The systematics of lobose testate amoebae (Arcellinida), a diverse group of shelled free-living unicellular eukaryotes, is still mostly based on morphological criteria such as shell shape and composition. Few molecular phylogenetic studies have been performed on these organisms to date, and their phylogeny suffers from typical under-sampling artefacts, resulting in a still mostly unresolved tree. In order to clarify the phylogenetic relationships among arcellinid testate amoebae at the inter-generic and inter-specific level, and to evaluate the validity of the criteria used for taxonomy, we amplified and sequenced the SSU rRNA gene of nine taxa - Difflugia bacillariarum, D. hiraethogii, D. acuminata, D. lanceolata, D. achlora, Bullinularia gracilis, Netzelia oviformis, Physochila griseola and Cryptodifflugia oviformis. Our results, combined with existing data demonstrate the following: 1) Most arcellinids are divided into two major clades, 2) the genus Difflugia is not monophyletic, and the genera Netzelia and Arcella are closely related, and 3) Cryptodifflugia branches at the base of the Arcellinida clade. These results contradict the traditional taxonomy based on shell composition, and emphasize the importance of general shell shape in the taxonomy of arcellinid testate amoebae. © 2012 Elsevier GmbH.
Authors & Co-Authors
Gomaa, Fatma A.
Switzerland, Neuchatel
Université de Neuchâtel
Egypt, Cairo
College of Science
Todorov, Milcho
Bulgaria, Sofia
Institute of Biodiversity and Ecosystem Research at the Bulgarian Academy of Sciences
Heger, Thierry J.
Switzerland, Neuchatel
Université de Neuchâtel
Canada, Vancouver
The University of British Columbia
Mitchell, Edward A.D.
Switzerland, Neuchatel
Université de Neuchâtel
Lara, Enrique
Switzerland, Neuchatel
Université de Neuchâtel
Statistics
Citations: 55
Authors: 5
Affiliations: 4
Identifiers
Doi:
10.1016/j.protis.2011.12.001
e-ISSN:
16180941
Research Areas
Genetics And Genomics