1. Invertebrates 1

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

3. Sponges (Porifera) Most primitive Cells relatively independent Mostly marine No Symmetry 3

4. Cnidarians Mostly marine Radial Symmetry 4

5. Cnidarians Jellyfish Hydra Coral 5 Sea anemone Portuguese Man-O-War

6. Platyhelminthes Flatworms Bilateral symmetry Cephalization 6

7. Planarian – freshwater flatworm 7

8. Nematodes Tube-like digestive tract Roundworms! Mouth and anus No segmentation 8

9. Mollusks Clams, snails, squids Varied habitats –Marine –Freshwater –Terrestrial 9

10. Annelids Segmented worms Common earthworm Leech 10

11. Arthropods Joint-legged animals External skeleton Huge variation – mostly insects 11

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

13. Brittle Star – An Echinoderm 13

14. 14