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Trait� de Zoologie, Vol. 4: Vers (Suite), Mollusques, Tuniciers (Classic Reprint): Vers (Suite), Mollusques, Tuniciers (Classic Reprint)

Trait� de Zoologie, Vol. 4: Vers (Suite), Mollusques, Tuniciers (Classic Reprint): Vers (Suite), Mollusques, Tuniciers (Classic Reprint)

          
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Excerpt from Trait� de Zoologie, Vol. 4: Vers (Suite), Mollusques, Tuniciers

Quel que soit le point de vue auquel on se place, que la s�rie des Chitinophores soit une s�rie g�n�alogique ou une s�rie de convergence, il y a tout avantage � y placer les Nemathelminthes qui rompraient compl�tement l'homog�n�it� �vidente de la s�rie des N�phridi�s, tandis qu'ils se laissent facilement d�duire des Arthro podes par la seule application des r�gles habituelles de la morphologie. Effecti vement la plupart des N�mathelminthes sont parasites; ou a d�j� vu le parasitisme entrainer chez les Cop�podes, les 150podes, les Acariens et surtout les Lingua... lides l'ef�acement plus ou moins complet de la m�tam�ridation, la r�duction ou la disparition des organes de relation. C'est ce qu'on observe � divers degr�s chez les Nemathelminthes o� la d�gradation des organes de relation atteint m�me la cons titution intime de l'�l�ment musculaire. Ces ph�nom�nes de d�gradation sont d'ail leurs graduels. Il existe encore une m�tam�ridation ext�rieure chez les �chino d�rid�s, les desmoscol�cid�s et les larves des gordiac�s. On retrouve des traces de m�tam�ridation dans l'organisation des t�guments ou dans la disposition des organes internes chez les Gonnmc�s et les acanthoc�phales adultes; seuls les n�mato�des, � quelques rares exceptions pr�s, et les ch�tognathes ne laissent plus reconna�tre de m�tam�rides. Les liens des N�matoides avec les Gordiac�s sont cependant tels que, sans les m�tamorphoses de ces derniers, 'od n'aurait en aucune raison plausible de les �riger en classe distincte; or la disparition des m�tamorphoses rentre dans les r�gles connues de l'acc�l�ration embryog�nique. La disposition du syst�me nerveux des Gonnmc�s, leur musculature s'�loigne encore assez peu de ce qu'on observe chez les Arthropodes m�tam�rid�s; la r�duction des centres nerveux a un simple anneau p�rioesophagien, tel qu'on l'observe chez les n�mato�des, s'explique par un simple raccourcissement de la chaine ventrale, raccourcissement d�j� indiqu� � divers degr�s chez un grand nombre d'arthropodes et notamment chez les Acariens; la simplification de l'appareil musculaire est elle - m�me tellement graduelle chez les N�mato�des qu'elle a �t� invoqu�e pour la classification de ces animaux.

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Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com

This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.


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Product Details
  • ISBN-13: 9780332061030
  • Publisher: Forgotten Books
  • Publisher Imprint: Forgotten Books
  • Language: French
  • ISBN-10: 0332061035
  • Publisher Date: 24 Apr 2018
  • Binding: Hardback


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