RT Journal Article SR Electronic(1) A1 Klaveness, Dag A1 Shalchian-Tabrizi, Kamran A1 Thomsen, Helge Abildhauge A1 Eikrem, Wenche A1 Jakobsen, Kjetill S.YR 2005 T1 Telonema antarcticum sp. nov., a common marine phagotrophic flagellate JF International Journal of Systematic and Evolutionary Microbiology, VO 55 IS 6 SP 2595 OP 2604 DO https://doi.org/10.1099/ijs.0.63652-0 PB Microbiology Society, SN 1466-5034, AB 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., UL https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/ijs.0.63652-0