1. Animals: Mollusks, Annelids, Echinoderms & Arthropods

2. The Mollusks 23% of marine animals Characteristics: Radula
Rough tongue used to scrape food off surfaces
Muscular Foot
Internal Organs
Live on land, marine and fresh water

3. Bilateral Symmetry Mollusks have bilateral symmetry
Have left and right sides
Left and right sides are a mirror image of each other
Have Dorsal (top) and Ventral (bottom) sides

4. Gastropods Name means “Stomach Foot” Snails and Slugs
Many have a shell
Move using a large, muscular foot
Largest (land)-Giant African Snail

5. Bivalves Name means “Two Shells” Clams-dig down into the sand
Scallops-lie on surface and move around by shooting water
Oysters-cement their shells to rocks

6. Cephalopods Name means “Head Foot” Octopus & Squid
Have tentacles with suction cups
Use a beak to tear at food
Use ink to escape predators

8. Echinoderms Name means “Spiny Skin” Characteristics: Radial Symmetry
Several arms
Have 5 body segments
Each has duplicate sets of organs
Move using tube feet

10. The Annelids Characteristics: Worms with clear body segments
Bilateral Symmetry
Closed circulatory system
One-way digestive system
Nervous system
Live on land, fresh & marine water

11. Annelid Anatomy

13. Arthropods Make up 90% of the Animal Kingdom Characteristics:
Exoskeleton
Body divided into sections
Jointed legs
Bilateral Symmetry

14. Crustaceans Characteristics: 2 Body Segments 2 sets of antennae
5 or more leg pairs
Mostly aquatic

15. Centipedes Characteristics: Well defined head One pair of antennae
One pair of legs per body segment
Flattened body

16. Millipedes Characteristics: Well-defined head One pair of antennae
2 pairs of legs per body segment
Cylindrical Body

17. Arachnids Characteristics: 2 body regions 8 legs No antennae
Moving mouth parts

18. Insects Characteristics: 3 body regions
6 legs attached to middle body segment
2 antennae
Large compound eyes
Some have wings attached to middle body segment