Following are the main distinguishing features of phylum Mollusca:
(i) The animal shows bilateral symmetry.
(ii) They have soft bodies, so they are also called soft bodied animals.
(iii) Body is segmented and divided into head, foot and visceral mass.
(iv) A glandular fold, the mantle, is present over the body.
(v) There is a calcareous shell around the body in some molluscs.
(vi) They have open circulatory system.(vii) Kidney-like organs for excretion are present.
Examples: Pila, Sepia, octopus.
