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Zoomorphology

, Volume 117, Issue 3, pp 135–145 | Cite as

Ultrastructure and function of the pharynx of Gnathostomula paradoxa (Gnathostomulida)

  • H. Herlyn
  • Ulrich Ehlers
ORIGINAL ARTICLE

Abstract

 The pharynx of Gnathostomula paradoxa consists of the partly syncytial pharyngeal musculature, a pharyngeal epithelium, myoepitheliocytes, receptors, nerves, and three solid parts, called the jugum, the basal plate, and the jaw. Extended non-contractile regions of both pharyngeal and body wall musculature form the so-called parenchymatous tissue between the digestive tract and the body wall. The pharyngeal epithelium mediates the force from the pharyngeal musculature to the solid parts. The basal plate and jaw contain longitudinal cuticular rods which are elastic antagonists of the musculature. There is no buccal ganglion in G. paradoxa. The study supports the monophyly of the Gnathostomulida and Gnathifera.

Keywords

Digestive Tract Basal Plate Body Wall Wall Musculature Solid Part 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • H. Herlyn
    • 1
  • Ulrich Ehlers
    • 1
  1. 1.II. Zoologisches Institut und Museum der Universität Göttingen, Berliner Strasse 28, D-37073 Göttingen, Germany Fax: 0049-511-5448; e-mail: hherlyn@gwdg.deDE

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