The second largest phylum of Animalia is Mollusca.
Molluscs are terrestrial or aquatic(marine or freshwater).
They are bilateral symmetry, and triploblastic.
They have an organ-system level of organization.
Molluscs have open circulatory systems.
The body is divided into the head, visceral mass, muscular foot, and mantle.
Following are a few examples of the animals belonging to phylum Mollusca: Pila (Apple snail), Limax (Slug), Unio (Freshwater mussel), Turbinella (Shankha), Helix (Garden snail), Octopus (Devilfish), Loligo (Squid).