A powerpoint presentation on Invertebrates. It includes the 8 classes of inverterbates and some examples for each phylum. Enjoy the presentation!

1. INVERTEBRATES

2. Invertebrates
 Animals without backbones
 97% of all animal species

3. Invertebrates
Phylum Annelida
Phylum Porifera
Phylum Molluska
Phylum Cnidaria
Phylum Echinodermata
Phylum Platyhelminthes
Phylum Arthropoda
Phylum Nematoda

4. PHYLUM PORIFERA (Sponges)
• “Porifera” means pore – bearing
• lacks true tissues & organs; incomplete
digestive system
• has skeleton that supports & protects the
body; made up of “spicules”

6. PHYLUM CNIDARIA
• Radially symmetric
• digestive chambers with a single
opening, which serves as both mouth &
anus
• Includes: hydras, jellyfish, corals and sea
anemones

7. PHYLUM CNIDARIA
2 body forms: polyp form and medusa form
1. polyp form - cylindrical; mouth & tentacles
at the upper end
2. medusa form – shaped like an upside-down
bowl; mouth & tentacles facing downward
has tentacles with stinging cells called “cnidocytes”
that paralyzes their preys
Jellyfish -medusa
Coral - polyp

8. Sea anemones Jellyfish
Coral
Hydra

9. PHYLUM PLATYHELMINTHES
(Flatworms)
• with flattened bodies; bilateral symmetry
• lacks body cavity
• most flatworms are parasites

10. PHYLUM PLATYHELMINTHES
(Flatworms)
• 3 major groups: flukes, planaria & tapeworms
1. Flukes – parasites that absorb the
nutrients from the body of a host harming it;
causes a disease called schistosomiasis
2. Planarians – non-parasitic, lives in moist
environments & free-living
3. Tapeworms – long ribbon-like flatworm;
can infect humans through eating
undercooked meat of an infected cow or pig

11. Fluke
Planaria
Tapeworm

12. PHYLUM NEMATODA
(Roundworms)
• has cylindrical bodies tapered at both ends &
covered by a tough cuticle
• includes parasitic types:
trichina, filaria, pinworms, & hookworms
• Many are introduced through poorly cooked
pork or walking barefoot in contaminated
areas.
• Some diseases caused by roundworms:
elephantiasis, trichinosis.

13. Pinworm Filaria
Hookworms Trichina

14. PHYLUM ANNELIDA
(Segmented Worms)
• With segmented bodies which has a ringed
appearance
• Includes: earthworms & leeches

15. PHYLUM MOLLUSKA (Mollusks)
• Second largest animal phylum
• Includes: oyster, clams, snails, squids
and octopuses
• Some are sources of food for
humans.

16. Oysters
Clams

17. Snail
Squid
Octopus

18. PHYLUM ECHINODERMATA
(Spiny-skinned)
• Includes: starfish, sea urchin and sea
cucumbers
• Has internal skeleton for support &
protection

19. Starfishes
Sea cucumber
Sea urchins

20. PHYLUM ARTHROPODA
(Arthropods)
• Largest group in the animal kingdom
• Has exoskeleton; segmented body & joint
appendages
• Divided into 4 groups:
1. Crustaceans – lobsters, shrimps, crabs & crayfish
2. Insects – ants, mosquitoes, bees, wasps,
bugs & flies
3. Arachnids – spiders, mites & scorpions
4. Myriapods – centipedes & millipedes

21. Lobster Crayfish
Shrimp
Crustaceans
Crabs
Hermit crab

22. Name the insects!

23. Arachnids
Ticks
Spiders
Scorpion
Mites

24. Myriapods

25. The End