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Revisiting the Phylogenetic Position of Synchroma grande

Authors

  • VISHWANATH PATIL,

    1. Department of Plant and Environmental Sciences, The Norwegian University of Life Sciences, P.O. Box 5003, N-1432, Ås, Norway, and
    2. Department of Biology, Centre for Ecological and Evolutionary Synthesis (CEES), University of Oslo, P.O. Box 1006 Blindern, 0316 Oslo, Norway, and
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    • 1Present Address: Borregaard, Biorefinery R & D, P.O. Box 162, 1701 Sarpsborg, Norway.

  • JON BRÅTE,

    1. Department of Biology, Centre for Ecological and Evolutionary Synthesis (CEES), University of Oslo, P.O. Box 1006 Blindern, 0316 Oslo, Norway, and
    2. Microbial Evolution Research Group (MERG), Department of Biology, University of Oslo, P.O. Box 1006 Blindern, 0316 Oslo, Norway
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  • KAMRAN SHALCHIAN-TABRIZI,

    1. Microbial Evolution Research Group (MERG), Department of Biology, University of Oslo, P.O. Box 1006 Blindern, 0316 Oslo, Norway
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  • KJETILL S. JAKOBSEN

    1. Department of Biology, Centre for Ecological and Evolutionary Synthesis (CEES), University of Oslo, P.O. Box 1006 Blindern, 0316 Oslo, Norway, and
    2. Microbial Evolution Research Group (MERG), Department of Biology, University of Oslo, P.O. Box 1006 Blindern, 0316 Oslo, Norway
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Corresponding Author: Kjetill S. Jakobsen, Department of Biology, Centre for Ecological and Evolutionary Synthesis (CEES), University of Oslo, P.O. Box 1006 Blindern, 0316 Oslo, Norway—Telephone number: +47 22854601; FAX number: +47 22854001; e-mail: k.s.jakobsen@bio.uio.no

Abstract

ABSTRACT. Two new classes Synchromophyceae and Picophagea, belonging to the heterokonts, have been proposed recently in separate studies of 18S rRNA phylogenies. Here we revise the 18S phylogeny of these classes by including all available sequenced species and applying Bayesian and maximum likelihood methods; Synchroma grande groups with the photophagotrophic Chlamydomyxa labyrinthuloides with high statistical support. This clade is sister to Chrysophyceae, together they share a common ancestry. Our results show that the creation of class Synchromophyceae by Horn et al. was premature, because they did not include data from the closely related C. labyrinthuloides and Picophagus flagellatus species. A revision of these classes should include additional species and most likely multigene phylogenies.

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