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

Shinta Fujimoto, Atsushi C. Suzuki, Masato Ito, Takeshi Tamura, Megumu Tsujimoto

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)679-693
Number of pages15
JournalPolar Biology
Volume43
Issue number6
DOIs
Publication statusPublished - 2020 Jun 1

Keywords

  • Marine meiofauna
  • Molecular phylogenetics
  • Postembryonic development
  • Styraconyx
  • Zoogeography

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)

Fingerprint Dive into the research topics of 'Marine tardigrades from Lützow-Holm Bay, East Antarctica with the description of a new species'. Together they form a unique fingerprint.

  • Cite this