These animals have a soft, unsegmented body, with a hard, calcareous shell to protect the soft body. They have a muscular foot to help in locomotion and also to act as a weapon in some cases.
Examples: snails, slugs, oysters, mussels, clams, squids, and octopuses.
- Unsegmented soft-bodied animals terrestrial or aquatic
- Exoskeleton in the form of a shell. When present shell is usually univalved or bivalved; internal shell present in some.
- Sexes separate or united.
- Have a muscular foot for locomotion.
Examples: Apply snail (Pila), Freshwater mussel (Unio), Cuttlefish (Sepia), Slugs, Octopus.