Following are the characteristics of Mollusc's:
A. Mollusc's are protostomes, have coelom reduced to cavities surrounding heart, nephridia and gonads.
B. Mollusc's members possess a head-foot, visceral mass, mantle and mantle cavity.
C. The rasping organ consists of muscular belt with rows of posteriorly curved teeth.
D. The molluscan body form in the cephalopoda undergoes a 180° anti-clockwise twisting of visceral mass.
E. Protostome characteristics for molluscs also include trocophore larvae spiral cleavage and schizococelous coelom formation.
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