• Sepia is a marine mollusc.

• Its shell is covered completely (internally) by mantle.

• Sepia has an in sac opening in its rectum.

• A distinct foot is absent.

• Body has two divisions - Head and trunk.

• Trunk is covered by a thick and leathery mantle.

• With the help of the ink this animal can discolour the surrounding water to escape from enemies.

• Skin is markable for its extra ordinary colour change.

• Two long tentacular arms with suckers.