Molecular phylogeny of Cercomonadidae and kinetid patterns of Cercomonas and Eocercomonas gen. nov. (Cercomonadida, Cercozoa)

Protist
Serguei A KarpovThomas Cavalier-Smith

Abstract

Cercomonads are among the most abundant and widespread zooflagellates in soil and freshwater. We cultured 22 strains and report their complete 18S rRNA sequences and light microscopic morphology. Phylogenetic analysis of 51 Cercomonas rRNA genes shows in each previously identified major clade (A, B) two very robust, highly divergent, multi-species subclades (A1, A2; B1, B2). We studied kinetid ultrastructure of five clade A representatives by serial sections. All have two closely associated left ventral posterior microtubular roots, an anterior dorsal root, a microtubule-nucleating left anterior root, and a cone of microtubules passing to the nucleus. Anterior centrioles (=basal bodies, kinetosomes) of A1 have cartwheels; the posterior centriole does not, suggesting it is older, and implying flagellar transformation similar to other bikonts. Strain C-80 (subclade A2) differs greatly, having a dorsal posterior microtubule band, but lacking the A1-specific fibrillar striated root, nuclear extension to the centrioles, centriolar diaphragm, extrusomes; both mature centrioles lack cartwheels. For clade A2 we establish Eocercomonas gen. n., with type Eocercomonas ramosa sp. n., and for clade B1 Paracercomonas gen. n. (type Paracercom...Continue Reading

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Citations

Jun 7, 2006·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Thomas Cavalier-Smith
Sep 15, 2007·BMC Evolutionary Biology·David BassThomas Cavalier-Smith
Mar 31, 2012·Annual Review of Marine Science·David A CaronAstrid Schnetzer
Jan 3, 2012·Protist·Thomas Cavalier-Smith, Brian Oates
Jul 26, 2011·Protist·Alexis T HoweThomas Cavalier-Smith
Apr 4, 2009·The Journal of Eukaryotic Microbiology·Thomas Cavalier-Smith
Jul 7, 2010·Environmental Microbiology·Edvard GlücksmanDavid Bass
Feb 2, 2010·The Journal of Eukaryotic Microbiology·Jan Pawlowski, Beatrice Lecroq
Jul 15, 2015·European Journal of Protistology·Alexander P MylnikovClaudia Wylezich
Mar 24, 2016·The Journal of Eukaryotic Microbiology·Sebastian PlochMichael Bonkowski
Mar 26, 2013·European Journal of Protistology·Aaron A HeissAlastair G B Simpson
Nov 29, 2014·Nucleic Acids Research·Matus ValachB Franz Lang

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