Planomonadida ord. nov. (Apusozoa): ultrastructural affinity with Micronuclearia podoventralis and deep divergences within Planomonas gen. nov

Protist
Thomas Cavalier-SmithSergei Nikolaev

Abstract

Gliding zooflagellates previously misidentified as Ancyromonas sigmoides, Metopion or Heteromita constitute a new genus Planomonas. Three new Planomonas species (marine P. micra and P. mylnikovi: freshwater P. limna) have extremely divergent 18S rRNA and subtly but consistently different light microscopic morphology, distinguishable from P. (=Ancyromonas) melba comb. nov. and P. (=Bodo) cephalopora comb. nov. Ultrastructurally, P. micra and P. mylnikovi have a sub-plasma membrane dense pellicular layer (except in the ventral feeding pocket whose rim is supported by microtubules), kinetocysts, and flat mitochondrial cristae. Centrioles, connected at approximately 80 degrees by short fibres, have a dense amorphous distal plate below a double axosome and four microtubular roots. Microbody, mitochondrion, and dictyosomes associate with the nucleus. Longitudinal cytokinesis is slow and peculiar; ciliary transformation is from anterior to posterior as in other bikonts. Planomonads, like the non-flagellate Micronuclearia (here grouped with planomonads as Hilomonadea cl. nov.), have an indistinguishable single dense pellicular layer, not a double layer like apusomonads (comprising emended class Thecomonadea, phylum Apusozoa). We also s...Continue Reading

References

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Citations

Nov 14, 2008·Proceedings. Biological Sciences·Marianne A MingeKjetill S Jakobsen
Dec 17, 2009·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Thomas Cavalier-Smith
Aug 21, 2009·Molecular Biology and Evolution·Matthew W BrownJeffrey D Silberman
Aug 30, 2013·Proceedings. Biological Sciences·Matthew W BrownAndrew J Roger
Mar 23, 2011·Protist·Aaron A HeissAlastair G B Simpson
Oct 22, 2008·The International Journal of Biochemistry & Cell Biology·T Cavalier-Smith
Apr 4, 2009·The Journal of Eukaryotic Microbiology·Thomas Cavalier-Smith
Oct 2, 2012·The Journal of Eukaryotic Microbiology·Sina M AdlFrederick W Spiegel
Aug 26, 2014·Molecular Phylogenetics and Evolution·Thomas Cavalier-SmithRhodri Lewis
Feb 2, 2013·European Journal of Protistology·Edvard GlücksmanThomas Cavalier-Smith
Mar 26, 2013·European Journal of Protistology·Aaron A HeissAlastair G B Simpson

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