Mode de mastication :
- Pièces buccales des céphalopodes
Mode de locomotion :
- Nage
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Caractères dérivés propres :
– Un tégument spécialisé, le manteau, sécrète des formations calcaires.
– Une structure buccale chitineuse dure et dentée, la radula, sert de râpe lorsque
l’animal se nourrit.
– Présence d’une cavité palléale (entre le manteau et son pli palléal et le pied).
– Présence de cténidies : branchies en forme de peigne.
– 16 paires de muscles dorsaux-ventraux.