Mollusks27-4

Free-swimming larval stage of an aquatic mollusk.

Trochophore

Muscular part of a mollusk.

Foot

Thin layer of tissue that covers most of the mollusk’s body.

Mantle

Structure in mollusks made by glands in the mantle that secrete calcium carbonate.

Shell

Area beneath the mantle of a mollusk that contains the internal organs.

Visceral Mass

Tongue-shaped structure used for feeding by snails and slugs.

Radula

Tubelike structure through which water enters and leaves a mollusks body.

Siphon

System in which blood is not always contained within a network of blood vessels.

Open Circulatory System