1. Mollusks SWBAT describe the body and the forms of movement used by the octopus; describe the body of the clam; explain how the clam obtains food.

2. Mollusks What are the three classes of Mollusks, and what is their defining characteristic? What are the three classes of Mollusks, and what is their defining characteristic? Gastropoda Gastropoda Coiled shells Coiled shells Cepholapoda Cepholapoda Tentacles Tentacles Bivalvia Bivalvia Two part, hinged shells Two part, hinged shells

3. The Octopus Describe the body and forms of movement used by the octopus. Describe the body and forms of movement used by the octopus. Eight arms that allow it to move in any direction Eight arms that allow it to move in any direction No firm support – but lots of muscles No firm support – but lots of muscles Suction disks – allow grasping Suction disks – allow grasping Mouth under “head”, in the center of arms Mouth under “head”, in the center of arms Anchors its arms to move its body Anchors its arms to move its body Can regenerate arms Can regenerate arms Moves slowly Moves slowly Rapid movement requires water to be forced out through a siphon, which can also release a “smoke screen” of ink Rapid movement requires water to be forced out through a siphon, which can also release a “smoke screen” of ink Thin, flexible body that can fit in small areas Thin, flexible body that can fit in small areas

4. The Clam Describe the body of a clam Describe the body of a clam Hard hinged shell to protect it Hard hinged shell to protect it Soft body is covered by a thin skin called the mantle Soft body is covered by a thin skin called the mantle The outside of the skin manufactures the material that hardens to become the shell The outside of the skin manufactures the material that hardens to become the shell Muscles keep its shell closed tight Muscles keep its shell closed tight It has a muscle foot that allows it to move It has a muscle foot that allows it to move

5. The Clam How do clams eat? How do clams eat? They are filter feeders They are filter feeders Send out two siphon tubes, one draws water in and other siphons out the waste Send out two siphon tubes, one draws water in and other siphons out the waste