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Die Phylogenetischen Symmetrieveränderungen Bei Den Seeigeln

Die Phylogenetischen Symmetrieveränderungen Bei Den Seeigeln

          
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About the Book

In der Ontogenie keiner anderen Tiergruppe sind die Umwandlungen der Symmetrieverhaltnisse vom Keim bis zum ausgewachsenen Tier so radikal und mannigfaltig wie bei den Echinodermen. Am schematisch klarsten gehen sie bei den Seeigeln vor sich, die uns im folgenden im wesentlichen be- schaftigen solI en. Aus der streng bilateralsymmetrischen Larve geht unter Drehung der Bila- 0 teralsymmetrieebene um 90 ein bilateralsymmetrischer junger Seeigel her- vor. Aber noch bevor die Metamorphose ganz abgeschlossen ist, wird der- selbe streng radiarsymmetrisch, und seine oral-aboral-Achse steht zu der Langsachse der Larve in einem rechten Winkel. Die linke Seite der Larve wird zur Oralseite, dieorechte zur Aboralseite des Seeigels. Dies ist der definitive Zustand bei den regularen Seeigeln. Bei den irregularen Seeigeln ist die Entwicklung zunachst dieselbe. Aber noch bevor ein streng radiarsymmetrisches Stadium erreicht wirdo, bildet sich eine sekun- dare Bilateralsymmetrie heraus, die mit der Bilateralsymmetrie der jungen regularen Seeigel nicht identisch ist. Vielmehr stehen die Symmetrie- ebenen in einem Winkel von 0 Grad zueinander. 72 Es ist offensichtlich, daB die Ausbildung der Radiarsymmetrie im Tierreich mit dem Verlust der aktiven freien Beweglichkeit zusammenhangt. Finden wir sie doch entweder bei planktontischen Tieren, deren Fortbewegung im wesentlichen durch das Medium, in welchem sie sich befinden, bestimmt wird (Radiolarien, Medusen) oder bei sessilen Tieren. Unter den letzteren konnen wir eine Reihe zusammenstellen, welche die Etappen aufzeigt, in denen sich die Umwandlung der Bilateralsymmetrie in die Radiarsymmetrie vollziehen kann.


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Product Details
  • ISBN-13: 9783663002864
  • Publisher: Vs Verlag Fur Sozialwissenschaften
  • Publisher Imprint: Vs Verlag Fur Sozialwissenschaften
  • Edition: 1958 ed.
  • Language: German
  • Returnable: N
  • Spine Width: 3 mm
  • Width: 210 mm
  • ISBN-10: 3663002861
  • Publisher Date: 01 Jan 1958
  • Binding: Paperback
  • Height: 297 mm
  • No of Pages: 57
  • Series Title: Forschungsberichte Des Wirtschafts- Und Verkehrsministeriums
  • Weight: 168 gr


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