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Invertebrates
copyright cmassengale

2. Simple Invertebrates many shapes and sizes symmetrical
Most animals are invertebrates
NO backbone

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

4. Sponges (Porifera) Live in water Have a skeleton that protects body
Mostly marine
No Symmetry

5. Cnidarians
Mostly marine
Radial Symmetry
Have stinging cells

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

7. Platyhelminthes
Flatworms
Bilateral symmetry
Ex. Tapeworm

8. Planarian – freshwater flatworm

9. Nematodes Tube-like digestive tract Roundworms! Mouth No segmentation
Help keep soil healthy
Can cause disease (ex. If pork is not fully cooked)

10. Mollusks Clams, snails, squids Soft body (most live in a shell)
Largest phylum
Varied habitats
Marine
Freshwater
Terrestrial

11. Annelids Segmented worms Common earthworm
Breakdown plants and animal matter
Leech

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

13. Echinoderms Always marine Starfishes, sea urchins, sea lilies
Spiny skin
Endoskeleton (internal skeleton)

14. Brittle Star – An Echinoderm

15. Protection Endoskeleton Exoskeleton Internal Outside (ex. Shells)
9/10/2018

16. The End