• Chiton is sedimentary or slow moving marine mollusk.

• Body is bilaterally symmetrical, dorso ventrally flattened and roughly ovoid.

• Body is divisible into Head, Visceral mass and foot.

• Head indistinct without eyes and tentacle.

• Foot is broad and flat ventral side – adhesion and creeping.

• Mouth and anus are ventral at opposite ends.

• Body covered dorsally by a thick, stiff and leathery mantle.

• Sexes are separate.

• Usually negative phototrophic.

• Mantle secretes dorsal shell, composed of 8 ringed or moveably articulated and overlapping transverse plates called Shell plates.