Despite of differences in many functions, why are octopus and pila kept in same phylum?? (3 similarities and 2 dissimilarities). Experts, plz help me... also if any student knows dis...

Octopus and Pila have many features similar as compared to dissimilar features, so they are grouped under same phylum- Mollusca.

Body of both the animals is covered by calcareous shell. Both have unsegmented body  with a distinct head, muscular foot and  and a visceral hump. In both, locomotion is brought by muscular foot. 

 Both have open circulatory system and kidney like organs for excretion.

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