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

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

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

5. Platyhelminthes
Flatworms
Bilateral symmetry
Cephalization

6. Planarian – freshwater flatworm

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

8. Mollusks Clams, snails, squids Varied habitats Marine Freshwater
Terrestrial

9. Annelids
Segmented worms
Common earthworm
Leech

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

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

12. Brittle Star – An Echinoderm