Telonemia
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Telonemia
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Telonemia is a phylum of microscopic eukaryote, single-celled organisms.[1] They were formerly classified as protists until that kingdom fell out of general use, and are suggested to have evolutionary significance in being a possible transitional form between ecologically important heterotrophic and photosynthetic species among chromalveolates.[2][3]
One paper places them in the SAR supergroup.[4] Phylogenomic analyses of 127 genes place Telonemia with Centroheliozoa in a group also consisting of cryptomonads and haptophytes[5] (see Cryptomonads-haptophytes assemblage).
Although they have been studied in primarily marine environments, they have also been found in freshwater.[6][7]
Telonemia: a new phylum related to the kingdom Chromista. It was recently discovered by Shalchian-Tabrizi et al. [36] that the 18S rDNA sequences formed two major groups, Group 1 and 2, including T. subtilis and T. antarcticum respectively, and that these were further sub-divided into several statistically supported clades of sequences with restricted geographic distribution. Species of Telonemia are heterotrophic predators, feeding on a wide range of bacteria and pico- to nano-sized phytoplankton. By using specific PCR primers we reveal a much larger diversity of Telonemia from environmental samples than previously uncovered by eukaryote-wide primers. They are globally distributed in marine waters and are frequently encountered in environmental clone libraries. The evolutionary origin of Telonema was inferred from phylogenetic reconstruction of single- and concatenated sequences obtained from both cultured strains and environmental clones (SSU only). [8]
Species
Although only two species have been described formally,[9] DNA sequences collected from seawater suggest there are many more species which have not yet been described.[10]
- Telonema antarctica Thomsen 1992
- Telonema subtile Griessmann 1913 (synonym Telonema subtilis Griessmann, 1913)[11]
References
- ↑ http://www.apollon.uio.no/vis/art/2006_4/Artikler/telonemia_english
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- ↑ http://www.cees.no/component/option,com_seminar/id,98
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External links
- Taxonomy, from the Taxonomy Browser of the National Center for Biotechnology Information.
- Images, etc. from iSpecies.org
