Project 2234: S. Fujimoto, A. Jørgensen, J. G. Hansen. 2017. A molecular approach to arthrotardigrade phylogeny (Heterotardigrada, Tardigrada). Zoologica Scripta. 46 (4):496-505.
Specimen: Coronarctus sp. (unvouchered)
View: Micrographs taken at 400x magnification


The marine order Arthrotardigrada (class Heterotardigrada, phylum Tardigrada) is known for its conspicuously high morphological diversity and has been traditionally recognized as the most ancestral group within the phylum. Despite its potential importance in understanding the evolution of the phylum, the phylogenetic relationships of Arthrotardigrada have not been clarified. This study conducted molecular phylogenetic analyses of the order encompassing all families except Neoarctidae using nuclear 18S and 28S rRNA fragments. Data from two rare families, Coronarctidae and Renaudarctidae, were included for the first time. The analyses confirmed the monophyly of Heterotardigrada and inferred Coronarctidae as the sister group to all other heterotardigrade taxa. Furthermore, the results support a monophyletic Renaudarctidae + Stygarctidae clade, which has been previously suggested on morphology. Our data indicated that two subfamilies currently placed in Halechiniscidae are only distantly related to this family. We propose that these taxa are each elevated to family level (Styraconyxidae (new rank) and Tanarctidae (new rank)). The morphology of tardigrades is discussed in the context of the inferred phylogeny. (from Fujimoto, S., Jørgensen, A. & Hansen, J.G. (2017). A molecular approach to arthrotardigrade phylogeny (Heterotardigrada, Tardigrada). Zoologica Scripta, 46, 496–505.)

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Article DOI: 10.1111/zsc.12221

Project DOI: 10.7934/P2234,
This project contains
  • 42 Media
  • 22 Taxa
  • 22 Specimens
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MorphoBank Project 2234
  • Creation Date:
    13 August 2015
  • Publication Date:
    06 February 2019
  • Project views: 22136

    Authors' Institutions

    • Copenhagen University

    • Kyoto University

    • Tohoku University

    • Natural History Museum of Denmark


    member name taxa specimens media
    Shinta Fujimoto
    Project Administrator
    Jesper G. Hansen
    Full membership
    Aslak Jørgensen
    Full membership

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