1. Mollusks

2. Mollusk Features True coelum Bilateral symmetry 3 part body plan
A) Visceral Mass: central section; contains organs
B) Mantle: Tissue that secretes shell
C) Muscular Foot

3. Mollusk Features Have organ systems Usually separate male/female sexes
Shells: made of protein and calcium
Radula: tongue-like organ to scrape food

4. Gastropods: slugs, snails
“Stomach Foot”
Mostly marine
Most single shell
Foot secretes slime to move
Feeding:
Herbivores: scrape food with radula
Predators: poisonous dart to swallow prey whole

5. Poor fishy

6. Bivalves: clams Most marine Shell secreted by mantle
No distinct head region or radula
Filter feeders
Sperm & egg released into water
Larvae free swimming

7. Cephalopods: squid, octopus
“Head foot”
Large head attached to tentacles
Complex nervous system & brain
Expel water through siphon to move
Jet propulsion
Active predators

8. The Cuttlefish

9. The Cuttlefish in Action