|Class 9 Biology Diversity In Living Organisms||Mollusca|
The organisms belonging to this group are bilaterally symmetrical.
The coelomic cavity is reduced in these organisms.
There is little segmentation.
They have an open circulatory system.
They have kidney-like organs for excretion.
There is a foot that helps for movement.
Examples of animals belonging to this group are snails and mussels, pila, unio.