New insights on the musculature of filospermoid Gnathostomulida View Full Text


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Article Info

DATE

2017-12

AUTHORS

Ludwik Gąsiorowski, Nicolas Bekkouche, Martin V. Sørensen, Reinhardt M. Kristensen, Wolfgang Sterrer, Katrine Worsaae

ABSTRACT

The marine microscopic jaw worms, Gnathostomulida, belong to the early branching spiralian lineage Gnathifera and consist of two main clades—Filospermoidea and Bursovaginoidea. Previous studies of gnathostomulid musculature focused on the bursovaginoid taxa, and only LM and TEM techniques were employed in the previous investigations of two filospermoids, Haplognathia simplex and Pterognathia swedmarki. In the present study, we used F-actin staining combined with CLSM to reconstruct the musculature of H. simplex and H. filum and found far-reaching similarities in their jaw musculature. In addition to known pharyngeal muscles we found new apophyseal abductors not uncovered in bursovaginoid gnathostomulids, but which resemble certain muscles of the sister group (Micrognathozoa + Rotifera) and may present an autapomorphy of Gnathifera. The body wall musculature exhibits greater interspecific variation: H. simplex possesses a simple grid of thick longitudinal and thin circular muscles, whereas H. filum shows a very sparse body wall musculature devoid of circular fibers, a pattern similar to another interstitial worm, the enigmatic annelid Lobatocerebrum. The flexibility gained hereby may similarly represent an adaptation and restriction to ciliary gliding among sand grains. More... »

PAGES

413-424

References to SciGraph publications

  • 2014-12. Detailed reconstruction of the musculature in Limnognathia maerski (Micrognathozoa) and comparison with other Gnathifera in FRONTIERS IN ZOOLOGY
  • 1979-10. The fine structure of Gnathostomulid reproductive organs in ZOOMORPHOLOGY
  • 2012-09. Musculature of Seison nebaliae Grube, 1861 and Paraseison annulatus (Claus, 1876) revealed with CLSM: a comparative study of the gnathiferan key taxon Seisonacea (Rotifera) in ZOOMORPHOLOGY
  • 2000-08. Functional morphology of the muscles in Philodina sp. (Rotifera: Bdelloidea) in HYDROBIOLOGIA
  • 2004-07. Musculature and nervous system of Gnathostomula peregrina (Gnathostomulida) shown by phalloidin labeling, immunohistochemistry, and cLSM, and their phylogenetic significance in ZOOMORPHOLOGY
  • 1997-10. Ultrastructure and function of the pharynx of Gnathostomula paradoxa (Gnathostomulida) in ZOOMORPHOLOGY
  • 1980-02. A new group of interstitial worms, Lobatocerebridae nov. fam. (Annelida) and its significance for metazoan phylogeny in ZOOMORPHOLOGY
  • 1979-02. Fine structure of the male reproductive system in two species ofHaplognathia sterrer (Gnathostomulida, Filospermoidea) in ZOOMORPHOLOGY
  • 2015-12. Detailed reconstruction of the nervous and muscular system of Lobatocerebridae with an evaluation of its annelid affinity in BMC EVOLUTIONARY BIOLOGY
  • 2005-04. Musculature in three species of Proales (Monogononta, Rotifera) stained with phalloidin-labeled fluorescent dye in ZOOMORPHOLOGY
  • 2016-03. The structure of the muscular and nervous systems of the female Intoshia linei (Orthonectida) in ORGANISMS DIVERSITY & EVOLUTION
  • 2017-06. Morphology and evolution of the nervous system in Gnathostomulida (Gnathifera, Spiralia) in ORGANISMS DIVERSITY & EVOLUTION
  • Journal

    TITLE

    Zoomorphology

    ISSUE

    4

    VOLUME

    136

    Author Affiliations

    Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s00435-017-0367-6

    DOI

    http://dx.doi.org/10.1007/s00435-017-0367-6

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1090745461


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