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

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  2. 2. Invertebrates Animals without backbones 97% of all animal species
  3. 3. Invertebrates Phylum Annelida Phylum Porifera Phylum Molluska Phylum Cnidaria Phylum EchinodermataPhylum Platyhelminthes Phylum Arthropoda Phylum Nematoda
  4. 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”
  5. 5. PHYLUM CNIDARIA• Radially symmetric• digestive chambers with a single opening, which serves as both mouth & anus• Includes: hydras, jellyfish, corals and sea anemones
  6. 6. PHYLUM CNIDARIA2 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 downwardhas tentacles with stinging cells called “cnidocytes”that paralyzes their preys Jellyfish -medusa Coral - polyp
  7. 7. Sea anemones JellyfishCoral Hydra
  8. 8. PHYLUM PLATYHELMINTHES (Flatworms)• with flattened bodies; bilateral symmetry• lacks body cavity• most flatworms are parasites
  9. 9. 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
  10. 10. Fluke PlanariaTapeworm
  11. 11. 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.
  12. 12. Pinworm FilariaHookworms Trichina
  13. 13. PHYLUM ANNELIDA (Segmented Worms)• With segmented bodies which has a ringed appearance• Includes: earthworms & leeches
  14. 14. PHYLUM MOLLUSKA (Mollusks)• Second largest animal phylum• Includes: oyster, clams, snails, squids and octopuses• Some are sources of food for humans.
  15. 15. Oysters Clams
  16. 16. Snail Squid Octopus
  17. 17. PHYLUM ECHINODERMATA (Spiny-skinned)• Includes: starfish, sea urchin and sea cucumbers• Has internal skeleton for support & protection
  18. 18. StarfishesSea cucumber Sea urchins
  19. 19. 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
  20. 20. Lobster Crayfish Shrimp Crustaceans CrabsHermit crab
  21. 21. Name the insects!
  22. 22. Arachnids TicksSpiders Scorpion Mites
  23. 23. Myriapods
  24. 24. The End