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Int J Syst Evol Microbiol 55 (2005), 2595-2604; DOI  10.1099/ijs.0.63652-0
© 2005 International Union of Microbiological Societies

Telonema antarcticum sp. nov., a common marine phagotrophic flagellate

Dag Klaveness1, Kamran Shalchian-Tabrizi1, Helge Abildhauge Thomsen2, Wenche Eikrem1 and Kjetill S. Jakobsen1

1 Department of Biology, University of Oslo, PO Box 1066 Blindern, N-0316 Oslo, Norway
2 Department of Botany, University of Copenhagen, Øster Farimagsgade 2D, DK-1353 København K, Denmark

Correspondence
Dag Klaveness
dag.klaveness{at}bio.uio.no

Telonema is a widely distributed group of phagotrophic flagellates with two known members. In this study, the structural identity and molecular phylogeny of Telonema antarcticum was investigated and a valid description is proposed. Molecular phylogeny was studied using small-subunit rRNA (SSU rRNA) gene sequences. The pear-shaped cell had two subequal flagella that emerged laterally on the truncated antapical tail. One flagellum had tripartite hairs. The cell was naked, but had subsurface vesicles containing angular paracrystalline bodies of an unknown nature. A unique complex cytoskeletal structure, the subcortical lamina, was found to be an important functional and taxonomic feature of the genus. Telonema has an antero-ventral depression where food particles are ingested and then transferred to a conspicuous anterior food vacuole. The molecular phylogeny inferred from the SSU rRNA gene sequence suggested that Telonema represents an isolated and deep branch among the tubulocristate protists.

Abbreviations: EM, electron microscopy; LM, light microscopy; ML, maximum-likelihood; MP, maximum-parsimony; SSU rRNA, small-subunit rRNA

Published online ahead of print on 17 June 2005 as DOI 10.1099/ijs.0.63652-0.

The GenBank/EMBL/DDBJ accession number for the small-subunit rRNA gene sequence of Telonema antarcticum is AJ564773.






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