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Invertebrates
copyright cmassengale

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

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

4. Sponges No mouth, stomachs, or other organs Most live in oceans
Cannot move
They stink a lot

5. Cnidarians
Mostly marine
Radial Symmetry

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

7. Invertebrates with Stinging Cells
They have tentacles
They have a mouth
They live on the ocean floor
They shoot poisonous darts
jellyfish
Sea anemone
coral

8. Platyhelminthes
Flatworms
Bilateral symmetry
Cephalization

9. Planarian – freshwater flatworm

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

11. Worms They can grow back parts if they lose parts.
Some worms can grow to 30 METERS long
An earthworm has hairs on it to help it go through the dirt!!!
                                                             
Flatworm
Roundworms
Segmented

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

13. Invertebrates with Soft Bodies
octopus
They live on land and fresh water and ocean water.
They make shells from minerals in the water
Two shelled mollusks has a big foot to pull itself along
snail
squid

14. Annelids
Segmented worms
Common earthworm
Leech

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

16. Invertebrates with Spiny Skins
They have bodies with at least 5 sections
They have suction cup feet to walk
They use tubes to catch food to.

17. Brittle Star – An Echinoderm

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

19. Arthropods There are 4 groups

20. Arthopods They have keen sense organs They have exoskeletons.
They have two or more segments

21. Crustaceans They have five pairs of legs
They live near or on the ocean floor
Live on land and water
They have antennae

22. Arachnids Spiders mites and ticks. 4 pairs of legs Most live on land.
Some live in fresh water
They are called parasites.

23. Insects Largest group of arthropods 3 pairs of legs
3 main body part sections
2 pairs of eyes
Have mouths

24. Millipedes & Centipedes
Many body segments
Live under rocks & dark places
Really have less than 100 legs
Protects itself by curling up
Millipedes have 4 legs on each segment
Centipedes have 2 legs on each segment
millipede
centipede