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
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