◆The mollusca word comes from latin word " mollis " means soft. Mollusca (soft bodied animals) ◆ Malacology - study of mollusca. ◆ Defination : Molluscs are soft bodied , Bilaterally symmetrical,unsegmented, Coelomate animals; usually shelled head and a dorsal visceral mass. ◆ Habitat : Molluscs are mostly marine ,few fresh water and some terrestrial forms. ◆Mollusca is the second largest phylum of invertebrates. ◆About 1,28,000 species. ◆ body soft covered by mantle usually with an anterior head and a ventral muscular foot.Mentle secrets shell.Shell sometimes vestigial and sometimes in several pieces. ◆Coelom reduced. ◆ example : Chiton, Pila(snail), Unio(mussel),Sepia, Loligo(squid), Nautilus, etc. Pila(snail)

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