Invertebrates

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Invertebrates

  1. 1. Invertebrates
  2. 2. What is an invertebrate? <ul><li>Invertebrates don’t have a backbone .
  3. 3. They are usually smaller than vertebrates.
  4. 4. All invertebrates are oviparous.
  5. 5. Most animals on earth are invertebrates.
  6. 6. Some live on land and others live in the soil.
  7. 7. Some live in water.
  8. 8. Some can fly. </li></ul>
  9. 9. What do invertebrates eat? <ul><li>Not all invertebrates eat the same food. </li></ul><ul><li>Some eat only plants. </li></ul><ul><ul><li>They are herbivores . </li></ul><li>Some eat only other animals. </li><ul><li>They are carnivores. </li></ul><li>Some eat plants and animals. </li><ul><li>They are omnivores. </li></ul></ul>
  10. 10. Classifying invertebrates <ul><li>It is more difficult to classify invertebrates because there are so many groups. </li></ul><ul><li>The most important groups are:
  11. 11. Molluscs
  12. 12. Anthropods
  13. 13. Worms
  14. 14. Jellyfish
  15. 15. Sponges
  16. 16. Starfish </li></ul>
  17. 17. Molluscs <ul><li>Mollusks have a soft , muscular body.
  18. 18. Some, like snails, have a shell .
  19. 19. Many molluscs live in the sea .
  20. 20. Mussels, oysters and octopuses are all molluscs. </li></ul>
  21. 21. Anthropods <ul><li>Anthropods are the biggest group of invertebrates.
  22. 22. Their bodies are divided into 3 parts.
  23. 23. They have a hard skin and joints in their legs.
  24. 24. Insects (ants and bees) and arachnids (spiders and scorpions) are anthropods. </li></ul>
  25. 25. Worms <ul><li>Worms have a long , soft body.
  26. 26. Some live on land and others live in water .
  27. 27. Some worms are parasites. They live inside another animal and feed on them. </li></ul>
  28. 28. Jellyfish <ul><li>Jellyfish live in water.
  29. 29. They have soft bodies and tentacles.
  30. 30. Be careful! Their tentacles can sting you! </li></ul>
  31. 31. Sponges <ul><li>Sponges have soft bodies covered with holes .
  32. 32. They live in water. </li></ul>
  33. 33. Starfish <ul><li>Starfish are protected by hard outer parts.
  34. 34. They live in water.
  35. 35. They usually have 5 arms , but some can have even 20! </li></ul>

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