1. Invertebrates 1 copyright cmassengale

2. Characteristics 1. Invertebrates do not have a backbone 2. Invertebrates do not have a cranium 2

3. Invertebrate Phyla Sponges Cnidarians Platyhelminthes Nematodes Mollusks Annelids Echinoderms Arthropods 3

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

5. Cnidarians Mostly marine Radial Symmetry 5

6. Cnidarians Jellyfish Hydra Coral 6 Sea anemone Portuguese Man-O-War

7. Platyhelminthes Flatworms Bilateral symmetry Cephalization 7

8. Planarian – freshwater flatworm 8

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. Arthropods Joint-legged animals External skeleton Huge variation – mostly insects 12

13. Echinoderms Always marine Starfishes, sea urchins, sea lilies Spiny skin 13

14. Brittle Star – An Echinoderm 14

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