A new Stygarctus (Arthrotardigrada: Stygarctidae) from Japan, with entangled seminal receptacle ducts

Shinta Fujimoto

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Stygarctus ayatori sp. nov. (Arthrotardigrada: Stygarctidae), is described from a sandy beach located at Okinoshima, Tat-eyama Bay, Boso Peninsula, Honshu, Japan. The most prominent characters were observed in the female genital structure, with the seminal receptacle ducts forming a three-dimensional entanglement near the exterior opening, and internal thick-ening situated peripheral to the gonopore and between the gonopore and anus. The new species is distinguished from the congeners by these characters; excluding S. abornatus McKirdy et al., 1976 for which there is no information on the gen-ital structure. However, S. ayatori sp. nov. and S. abornatus can be differentiated by the presence of dorsal spines on the former species, which are absent from the latter.

Original languageEnglish
Pages (from-to)187-195
Number of pages9
Issue number2
Publication statusPublished - 2014 Mar 27
Externally publishedYes


  • Intertidal zone
  • Marine tardigrade
  • Meiobenthos
  • Stygarctus ayatori sp. nov.
  • Tateyama Bay

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology


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