7th Grade Ch. 2 Sec. 2 Arthropods


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7th Grade Ch. 2 Sec. 2 Arthropods

  1. 1. Ch. 2 Sec. 2 Arthropods
  2. 2. Characteristics of Arthropods invertebrate <ul><li>exoskeleton </li></ul><ul><li>external </li></ul><ul><li>skeleton </li></ul>segmented body jointed appendages antenna = contains sense organs <ul><li>protects </li></ul><ul><li>prevents </li></ul><ul><li>evaporation </li></ul>
  3. 4. molting <ul><li>process of shedding outgrown exoskeleton </li></ul>Yikes!  My Skeleton is Outside My Body!
  4. 5. soft shelled crab
  5. 6. (crab, shrimp) (spider, tick) (bee, fly)
  6. 10. metamorphosis <ul><li>process in which an animal’s body undergoes dramatic changes in form during its life cycle </li></ul>Crab Larva This larva of a crab floats in the ocean with other microscopic animals.
  7. 11. <ul><li>. </li></ul>A crustacean is an arthropod that has two or three body sections, five or more pairs of legs, & two pairs of antennae - Arthropods
  8. 14. arachnids abdomen combined head & body section Red Knee Tarantula
  9. 15. examples of arachnids: scorpions dust mites deer ticks
  10. 17. spiders <ul><li>predators </li></ul><ul><li>have hollow fangs- </li></ul><ul><ul><li>inject venom into prey  </li></ul></ul><ul><ul><li>turns tissues into mush  </li></ul></ul><ul><ul><li>uses fangs like straws to suck out mush </li></ul></ul>
  11. 18. The Dangerous Brown Recluse Spider
  12. 19. This guy was bitten by a Brown Recluse spider. Day 3
  13. 20. The following illustrates the progression of a brown recluse spider bite. The affected skin actually dies on his body. Day 5
  14. 21. Black widow spider
  15. 23. More arthropod groups herbivores carnivores 2 pairs of legs on each segment 1 pair of legs on each segment millipedes centipedes
  16. 24. centipede
  17. 25. <ul><li>Millipedes in the Great Smoky Mountains National Park in Tennessee </li></ul>
  18. 26. When millipedes are disturbed, they can curl up into an armored ball and squirt an awful-smelling liquid at a potential predator.
  19. 28. Arthropods Crustaceans include have have have have Arachnids Centipedes and millipedes 6 legs, 3 body sections Four antennae Insects Eight legs, two body segments, no antennae Highly segmented body, 1 or 2 pairs of legs on each segment, 2 antennae 1. 2. 3. 4.