We'd like to understand how you use our websites in order to improve them. Register your interest. After a morphological observation, ecto and endoderms and their intercellular junctions are presented. The regionally different mesogleal synaptic nerve nets are surrounded by ecto and endodermal nervous structures. This is a preview of subscription content, log in to check access. Rent this article via DeepDyve.

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Displaying Editions 1 - 4 out of 4. Your list has reached the maximum number of items. Please create a new list with a new name; move some items to a new or existing list; or delete some items. Cours de zoologie. Cours de Zoologie. Fascicule 1, Protozoaires, sponciaires, cnidaires, plathelminthes, nemathelminthes. All rights reserved. Remember me on this computer. Cancel Forgot your password? Year 1 1 1 1 Language French 3 Undetermined 1. Print book.

Publication: Cours de zoologie. Print book : Mixed form. Publication: Cours de zoologie, 1 Paris : Centre de documentation universitaire. Home About Help Search.


les cnidaires

The early diverging metazoan lineages have highly disparate adult body plan geometries, which can be characterised in terms of five major types of symmetry asymmetrical, spherical, cylindrical, n -radial, bilateral. Patterns of evolutionary changes in symmetry types and the homology of body axes across lineages are discussed here by confronting evidence from comparative anatomy, phylogeny, genomics and evo-devo. The conventional scenario, postulating a graded complexification from asymmetry to radial and finally bilateral symmetry, is considered untenable. Cylindrical symmetry is likely to be the ancestral type from which derived all remaining types through multiple convergences. Recent proposals prompted by molecular data that the bilateral anatomies of many cnidarians and of the Bilateria are homologous are clearly not supported. The Hox-based patterning system operating along the antero-posterior axis of the Bilateria does not seem to predate their divergence with the Cnidaria, but intercellular signalling systems, notably the Wnt pathway, could have been involved in generating the main body axis in the last common ancestor of the Metazoa. To cite this article: M.


les cnidaires

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nutrition spongiaires, cnidaires et plathelminthes

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nutrition spongiaires, cnidaires et plathelminthes

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