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Telonemia, a new protist phylum with affinity to chromist lineages

AutorShalchian-Tabrizi, Kamran; Eikrem, Wenche; Klaveness, Dag; Vaulot, Daniel; Minge, M.A.; Le Gall, F.; Romari, Khadidja; Throndsen, J.; Botnen, A.; Massana, Ramon ; Thomsen, H.A.; Jakobsen, Kjetill S.
Palabras claveTelonema
Environmental sequences
Covarion substitution pattern
Fecha de publicaciónjul-2006
EditorRoyal Society (Great Britain)
CitaciónProceedings of the Royal Society B: Biological Sciences 273(1595): 1833-1842 (2006)
ResumenRecent molecular investigations of marine samples taken from different environments, including tropical, temperate and polar areas, as well as deep thermal vents, have revealed an unexpectedly high diversity of protists, some of them forming deep-branching clades within important lineages, such as the alveolates and heterokonts. Using the same approach on coastal samples, we have identified a novel group of protist small subunit (SSU) rDNA sequences that do not correspond to any phylogenetic group previously identified. Comparison with other sequences obtained from cultures of heterotrophic protists showed that the environmental sequences grouped together with Telonema, a genus known since 1913 but of uncertain taxonomic affinity. Phylogenetic analyses using four genes (SSU, Hsp90, alpha-tubulin and beta-tubulin), and accounting for gamma- and covarion-distributed substitution rates, revealed Telonema as a distinct group of species branching off close to chromist lineages. Consistent with these gene trees, Telonema possesses ultrastructures revealing both the distinctness of the group and the evolutionary affinity to chromist groups. Altogether, the data suggest that Telonema constitutes a new eukaryotic phylum, here defined as Telonemia, possibly representing a key clade for the understanding of the early evolution of bikont protist groups, such as the proposed chromalveolate supergroup
Descripción10 pages, 4 figures.-- The electronic supplementary material is available at http://dx.doi.org/10.1098/rspb.2006.3515
Versión del editorhttp://dx.doi.org/10.1098/rspb.2006.3515
ISSN0962-8452 (Print)
1471-2954 (Online)
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