Toxisarcon taimyr sp. nov., a new large monothalamous foraminifer from the Kara Sea inner shelf
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A large monothalamous foraminiferan, Toxisarcon taimyr sp. nov., has been isolated from the benthic samples from the Kara Sea inner shelf near the mouth of Yenisey river estuary, at a depth of 50–100 m. In its overall morphology, the new species closely resembles T. synsuicidica, one of the two species of Toxisarcon described to date. It possesses a large irregularly shaped cell body, covered by a thin layer of a fibrous organic coating. Numerous reticulopodia typically extend from all over the cell surface; the species is very motile and rapidly changes cell shape. Long and thick reticulopodial bundles form in the direction of movement. In the phylogenetic tree based on partial small-subunit ribosomal DNA (SSU rDNA) sequences, T. taimyr branches together with the two other known species of Toxisarcon within the clade C of monothalamous foraminifera.
KeywordsForaminifera Rhizaria Protist Arctic Benthos
The cruise was funded by Programme 23 of the Presidium of Russian Academy of Sciences and by Russian Foundation for Basic Research grant 11-051-0070-k. We thank Emanuela Reo and Maria Holzmann for their help with sequencing. This work was supported by the Otto Schmidt Laboratory grant OSL-13-11, Swiss National Science Foundation grant 31003A-140766 and a research grant IZLR Z3_128338 from Science and Technology Cooperation Program Switzerland–Russia.
Video of the cell body and granuloreticulopodia, magnification x630 (MPG 32506 kb)
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