College Biology: chapter 28 Mollusk and Annelid

Examples of Mollusks

Squid, Octopus, land snail, clams, and oysters

Coelomates

three-part body plan

Radula

a tongue like organ covered with thousands of pointed curving teeth used for feeding

Visceral Mass

central section of the body that contains the mollusk’s organ

Mantle

heavy fold of tissue outside the visceral mass that forms the outer layer of the body and secretes the mollusk’s shell

Foot

muscular region used primarily for locomotion

Nephridia

tiny tubular structures (kidney-like)

Trochophore

mollusks develop into larve

3 major classes of Mollusks

Gastropoda, Cephalopoda, Bivalvia

Gastropoda

snails, slugs

Cephalopoda

octopus, squid, cuttlefish, and naulilus

Bivalvia

clams, oysters, scallops

Adductor Muscles

open and close shell

Nacre

thin layers of a hard, shiny, substance