Phylogenetic placement of diverse amoebae inferred from multigene analyses and assessment of clade stability within 'Amoebozoa' upon removal of varying rate classes of SSU-rDNA

Molecular Phylogenetics and Evolution
Yonas I TekleLaura A Katz

Abstract

Placing amoeboid lineages on the eukaryotic tree of life is difficult due to the paucity of comparable morphological characters and the limited molecular data available for many groups. This situation has led to the lumping of distantly related lineages into large inclusive groups, such as Sarcodina, that do not reflect evolutionary relationships. Previous analyses of molecular markers with limited taxon sampling reveal members of Sarcodina are scattered in five of the six proposed supergroups. We have used multigene analyses to place seven diverse amoeboid lineages-two Nolandella spp., Rhizamoeba sp., Pessonella sp., Arcella hemisphaerica, Arachnula sp. and Trichosphaerium sp.-on the eukaryotic tree of life. Bayesian analysis of the concatenated data of the four genes sequenced (SSU-rDNA, actin, alpha-tubulin and beta-tubulin), including diverse representatives of eukaryotes, indicates that all seven taxa group within the 'Amoebozoa' supergroup. We further performed separate analyses of the well-sampled SSU-rDNA and actin genes using Bayesian and Maximum Likelihood analyses to assess the positions of our newly characterized taxa. In the case of SSU-rDNA, we performed extensive analyses with removal of the fastest rates classes...Continue Reading

Citations

Oct 15, 2010·Folia Parasitologica·Iva DykováHana Pecková
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Apr 2, 2009·The Journal of Eukaryotic Microbiology·Jan Pawlowski, Fabien Burki
Aug 12, 2010·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Laura A Katz, Alexandra M Kovner
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Jul 30, 2011·Protist·Alexey V SmirnovThomas Cavalier-Smith

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