Mode de mastication :
- Pièces buccales des céphalopodes
Mode de locomotion :
- Nage
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Le bec chitineux des céphalopodes, appelé aussi rostrum ou rostre, est une pièce anatomique à l’extrémité de l’orifice buccal des céphalopodes. Formé de deux mandibules, ce bec ressemble à ceux des Psittaciformes, mais la partie inférieure chevauche la partie supérieure. Extrêmement dur à son extrémité tranchante, il est difficile à rayer et couper et il a aussi la curiosité d’être élastique. Il est indépendant de la radula que possède tous les Mollusques (sauf les Lamellibranches).
(texte issue de wikipedia)