1. Invertebrates 1 copyright cmassengale

2. Invertebrate Phyla Sponges (Porifera) Cnidarians Platyhelminthes Nematodes Mollusks Annelids Echinoderms Arthropods 2

3. Characteristics 3

4. Sponges (Porifera) Most primitive Cells relatively independent Mostly marine No Symmetry 4

5. Cnidarians Mostly marine Radial Symmetry 5

6. Cnidarians-examples: Jellyfish Hydra Coral Sea anemone 6

7. Platyhelminthes Flatworms Bilateral symmetry Cephalization-have a head 7

8. Planarian – freshwater flatworm 8 Regeneration!

9. Nematodes Tube-like digestive tract Roundworms! Mouth and anus No segmentation 9

10. Mollusks Clams, snails, squids Varied habitats –Marine –Freshwater –Terrestrial 10

11. Annelids Segmented worms Common earthworm Leech 11

12. Echinoderms Always marine Starfishes, sea urchins, sea lilies Spiny skin 12

13. Brittle Star – An Echinoderm 13

14. Arthropods Joint-legged animals External skeleton Huge variation – mostly insects 14