Phylum Mollusca

1
Phylum Mollusca

• Mussels / Clams / oysters
• Snails / slugs
• Octopus / squid / nautilus

2
Class Bivalvia

• 2 valves (2 shells)
• Umbo
• Number of rings reveals age
• Adductor muscles
• Mother of pearl
• used to make buttons / jewerly

3
Class Bivalvia

• Clams
• Oysters
• Mussels
• barnacles

4
LOCOMOTION

• Foot -- digging
• Swimming
• Incurrent / excurrent siphons

5
Class Gastropoda (Univalvia)

• Gastrostomach poda foot
• Travels on stomach
• Snails/ slug
• Single valve
• Left handed / right handed