Diversity in the Living World


   
 
Phylum Mollusca
 
              Snail
 
Aquatic in habitat but some land forms are also seen.
 
Body is soft and divided into three regions (head, dorsal visceral mass and ventral foot).
 
Body enclosed in a hard calcareous shell.
 
Breathe through gills, land molluscs have lungs.
 
Sexes are separate.
 
Example: Chiton, Pila (snail), unio (fresh water mussel), octopus
 
  
     
   
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