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Marine tardigrades from Lutzow-Holm Bay, East Antarctica with the description of a new species


Fujimoto, S and Suzuki, AC and Ito, M and Tamura, T and Tsujimoto, M, Marine tardigrades from Lutzow-Holm Bay, East Antarctica with the description of a new species, Polar Biology, 43, (6) pp. 679-693. ISSN 0722-4060 (2020) [Refereed Article]

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© Springer-Verlag GmbH Germany, part of Springer Nature

DOI: doi:10.1007/s00300-020-02671-w


Marine tardigrades in the Antarctic and sub-Antarctic regions are poorly understood. During the 59th Japan Antarctic Research Expedition, a sediment sample was collected from Lützow-Holm Bay, East Antarctica. The sediment sample yielded three species of marine tardigrades belonging to the family Styraconyxidae Kristensen & Renaud-Mornant, 1983: Angursa antarctica Villora-Moreno, 1998, Styraconyx cf. qivitoq Kristensen & Higgins, 1984, and S. takeshii sp. nov. The new species resembles S. nanoqsunguak Kristensen & Higgins, 1984 by the overall morphology, but the new species has thick seminal receptacle ducts that do not terminate in typical, swelled vesicles, in contrast to S. nanoqsunguak’s narrow seminal receptacle ducts that terminate in small vesicles. The presence of the undivided mouth papilla and the larger body further differentiates the new species from S. nanoqsunguak. We also report a young adult female with a gonopore, but lacking seminal receptacles in the new species. As well as morphological information, we provided the sequences of the new species’ nuclear 28S rRNA and mitochondrial cytochrome c oxidase subunit I fragments. Using the former molecular data, phylogenetic analyses of Styraconyxidae were conducted and polyphyly of Styraconyx was suggested. The biogeography of marine tardigrades in the Antarctic and sub-Antarctic regions are also discussed.

Item Details

Item Type:Refereed Article
Keywords:marine meiofauna, molecular phylogenetics, postembryonic development, Styraconyx, zoogeography
Research Division:Biological Sciences
Research Group:Evolutionary biology
Research Field:Phylogeny and comparative analysis
Objective Division:Environmental Management
Objective Group:Management of Antarctic and Southern Ocean environments
Objective Field:Biodiversity in Antarctic and Southern Ocean environments
UTAS Author:Tamura, T (Dr Takeshi Tamura)
ID Code:143775
Year Published:2020
Web of Science® Times Cited:2
Deposited By:Ecology and Biodiversity
Deposited On:2021-04-01
Last Modified:2021-09-21

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