Concerning one obsolete tradition: Does gastrulation in sponges exist?

Concerning one obsolete tradition: Does gastrulation in sponges exist? The analysis of comparative-embryological and molecular-biological data leads to the conclusion that universal basic mechanisms of morphogenesis occurred first in the evolution of animals in the ancestors of modern sponges and eumetazoans, which served as a basis of different evolution of individual development in Parazoa and Eumetazoa lines. In the former, morphogenesis in early embryogenesis led to formation of the water-current system as a means for capturing and delivery of food particles to different parts of the animal. In the latter, morphogenetic movements manifested themselves as gastrulation, during which the germ layers and the digestive system formed. The morphogenetic movements of cells in Metazoa emerged independently of cell specification. They are primary relative to cell differentiation. The unity of all Metazoa is based on the similarity of mechanisms of morphogenesis rather than on the presence of germ layers. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Developmental Biology Springer Journals

Concerning one obsolete tradition: Does gastrulation in sponges exist?

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Publisher
Springer Journals
Copyright
Copyright © 2013 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Developmental Biology; Animal Anatomy / Morphology / Histology
ISSN
1062-3604
eISSN
1608-3326
D.O.I.
10.1134/S1062360413050020
Publisher site
See Article on Publisher Site

Abstract

The analysis of comparative-embryological and molecular-biological data leads to the conclusion that universal basic mechanisms of morphogenesis occurred first in the evolution of animals in the ancestors of modern sponges and eumetazoans, which served as a basis of different evolution of individual development in Parazoa and Eumetazoa lines. In the former, morphogenesis in early embryogenesis led to formation of the water-current system as a means for capturing and delivery of food particles to different parts of the animal. In the latter, morphogenetic movements manifested themselves as gastrulation, during which the germ layers and the digestive system formed. The morphogenetic movements of cells in Metazoa emerged independently of cell specification. They are primary relative to cell differentiation. The unity of all Metazoa is based on the similarity of mechanisms of morphogenesis rather than on the presence of germ layers.

Journal

Russian Journal of Developmental BiologySpringer Journals

Published: Sep 15, 2013

References

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