Aschelminth

The tube worms ( Nemathelminthes or Aschelminthes ), also referred to as a round or hollow worms, are a group of Urmündern ( Protostomia ), which had previously been considered due to some similarities in physique as a taxon. All tube worms have a highly developed foregut, which forms a muscular and equipped with cuticular reinforcements pharynx. Since the body cavity is not lined by an epithelium, it is usually as the primary body cavity ( blastocoel ) interpreted. In addition, common ( Eutelie ) multiple cell syncytia and Constance come before.

System

The exact scope of the tube worms was always controversial, the following taxa were usually assigned to them:

  • The scratch worms ( Acanthocephala )
  • The Bauchhärlinge ( Gastrotricha )
  • The Hakenrüssler ( Kinorhyncha )
  • The corset animals ( Loricifera )
  • Nematodes ( Nematoda )
  • The strings worms ( Nematomorpha )
  • The Priapswürmer ( Priapulida )
  • Rotifers ( Rotifera )

With the exception of Bauchhärlinge, scratch worms and rotifers, which today one of the flatworm -like ( Platyzoa ) are provided, they form the subgroup Cycloneuralia the molting animals ( Ecdysozoa ) in modern systematics.

Evidence

  • Volker Storch, Ulrich Welsch: Short textbook of zoology. 7 edition. Gustav Fischer, Stuttgart, Jena, New York 1994, ISBN 3-437-20507-2, pp. 426-433.
  • Alternative taxon
Organism Cuticle
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