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Subulatomonas tetraspora nov. gen. nov. sp. is a Member of a Previously Unrecognized Major Clade of Eukaryotes

2011; Elsevier BV; Volume: 162; Issue: 5 Linguagem: Inglês

10.1016/j.protis.2011.05.002

1618-0941

Laura A. Katz, Jessica R. Grant, Laura Wegener Parfrey, Anastasia Gant Kanegusuku, Charles J. O’Kelly, O. Roger Anderson, Robert E. Molestina, Thomas A. Nerad,

Marine Biology and Ecology Research

While a large number of aerobic free-living protists have been described within the last decade, the number of new anaerobic or microaerophilic microbial eukaryotic taxa has lagged behind. Here we describe a microaerophilic genus and species of amoeboflagellate isolated from a near-shore marine site off the coast at Plymouth, Massachusetts: Subulatomonas tetraspora nov. gen. nov. sp. This taxon is closely related to Breviata anathema based on both microscopical features and phylogenetic analyses of sequences of three genes: SSU-rDNA, actin, and alpha-tubulin. However, Subulatomonas tetraspora nov. gen. nov. sp. and B. anathema are morphologically distinctive, differ by 14.9% at their SSU-rDNA locus, and were isolated from marine and 'slightly brackish' environments, respectively. Phylogenetic analyses of these two taxa plus closely related sequences from environmental surveys provide support for a novel clade of eukaryotes that is distinct from the major clades including the Opisthokonta, Excavata, Amoebozoa and 'SAR' (Stramenopile, Alveolate, Rhizaria).