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Les vers : caract ristiques g n rales

aclomate. pseudo-clomate. clomate. 3 couches. Structure des triploblastiques. Les annlides : classification. 3 classes :Achtes (500 espces) : sangsuesOligochtes (3500 espces) : lombricPolychtes (10000 espces) : spirographe, sabelle, vers de feu3 rgions corporelles : prostomium, peristomium, pygidiumrespiration branchiale ou cutaneformes errantes et sdentaires.

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Les vers : caract ristiques g n rales

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    2. Structure des triploblastiques

    3. Les annlides : classification 3 classes : Achtes (500 espces) : sangsues Oligochtes (3500 espces) : lombric Polychtes (10000 espces) : spirographe, sabelle, vers de feu 3 rgions corporelles : prostomium, peristomium, pygidium respiration branchiale ou cutane formes errantes et sdentaires

    7. Les polychtes : schma gnral Clomates Segments, parapodes (excroissances) Systme circulatoire clos, vaisseau ventral contractile, hmoglobine Tube digestif complet, systme excrteur (nphridies), proboscis Ganglion crbrode, chane nerveuse ventrale Mouvements pristaltiques par contraction alternative des muscles longitudinaux et transversaux

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