1. Phylum Mollusca
Yum Yum

2. Defining Characteristics
Mantle- tissue that secretes calcium carbonate shell
Foot- locomotion
Soft-bodied (not including shell)

3. Classes Bivalvia- clams/ oysters Gastropoda- snails/ slugs
Cephalopoda- squid/ octopus

4. Bivalve Anatomy

5. Bivalves Sessile- clams motile- oysters Filter feeders
Gills for gas exchange
Excrete out anus
Separate sexes- broadcast gametes
Brain and major nerve cord (no cephalization)
Siphon- tube in- O2 rich water and food
-tube out-CO2 rich water

6. Digging Clam

7. Swimming Scallop

8. Gastropod Anatomy

9. Gastropods Mantle does not produce shell
Organ systems similar to bivalves
Crawl on stomach using muscular undulations
Radula- tongue-like structure used for feeding
hermaphroditic
Cephalization
Diffusion through gills/ wet membrane

10. Zombie Snail

11. Cephalopod Anatomy

12. Houdini the Octopus

13. Cephalopods Cephalo- head Pod-foot
Mantle produces bony plate to protect brain
Organ systems similar to bivalves
Large head
Well-developed nervous system
Siphon (funnel)- expels water…Quick moving
Closed circulatory system
Release ink to confuse predators
Eye- similar to mammals (retina, lens, cornea, iris)
Radula- for feeding

14. Your Activity
You are to circulate through each of the stations. Make observations on each of the type of shells and organisms in each Class.
Diagrams (in pencil)
Notes on patterns of growth