Cours Magistraux de Biologie des Organismes Animaux
Professeur : Phillipe MORA
Licence 1 : Sciences de la Vie et de la Terre - Parcours chimie biologie
Chapitre 3 : Les spongiaires ou Porifera
- Caractéristiques générales des spongiaires
- Structure fondamentales des éponges : le cas ...
Chapitre 3 : Les spongiaires ou Porifera
I. Caractéristiques générales
A. Aspects généraux
Métazoaires, diploblastiques, pas de réelle symétrie, pas d’organe, présence d’un squelette,
pas de système nerveux, corps comportant de très nombreux orifices (pores).
B. Mode de vie
Animaux aquatiques, vie fixée, animaux filtreurs.
II. Structure fondamentale des éponges : le cas de l’Olynthus
A. Aspect général
: filtration
L’oscule (ou pore exhalant) est unique.
B. Structure de la paroi
Le pinacocyte est une
barrière entre l’extérieur et
l’intérieur.
L’endoderme est formé
d’une seule couche et d’un
seul type de cellule qui
sont les choanocytes.
CM Biologie des organismes animaux
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