期刊
PROTIST
卷 161, 期 2, 页码 264-278出版社
ELSEVIER GMBH
DOI: 10.1016/j.protis.2009.10.004
关键词
Bicosoecida; flagellar apparatus; Placididae; MAST; Stramenopile
类别
资金
- Tula Foundation (Centre for Microbial Diversity and Evolution)
- National Science and Engineering Research Council of Canada (NSERC) [283091-04]
- Canadian Institute for Advanced Research
A novel free free-living phagotrophic flagellate, Rictus lutensis gen. et sp. nov., with two heterodynamic flagella, a permanent cytostome and a cytopharynx was isolated from muddy, low oxygen coastal sediments in Cape Cod, MA, USA. We cultivated and characterized this flagellate with transmission electron microscopy, scanning electron microscopy and molecular phylogenetic analyses inferred from small subunit (SSU) rDNA sequences. These data demonstrated that this organism has the key ultrastructural characters of the Bicosoecida, including similar transitional zones and a similar overall flagellar apparatus consisting of an x fiber and an L-shape microtubular root 2 involved in food capture. Although the molecular phylogenetic analyses were concordant with the ultrastructural data in placing R. lutensis with the bicosoecid clade, the internal position of this relatively divergent sequence with in the clade was not resolved. Therefore, we interpret R. lutensis gen. et sp. nov. as a novel bicosoecid incertae sedis. (C) 2009 Elsevier GmbH. All rights reserved.
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