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Phylum Arthropoda

Phylum Arthropoda. “jointed foot” animals Examples: spiders, insects, centipedes, millipedes, crustaceans. Traits. Jointed appendages. Traits. Segmented bodies. Traits. exoskeleton. Traits. Ventral nerve cord. Traits. Open circulatory system. Traits. Bilateral symmetry. Traits.

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Phylum Arthropoda

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  1. Phylum Arthropoda • “jointed foot” animals • Examples: spiders, insects, centipedes, millipedes, crustaceans

  2. Traits • Jointed appendages

  3. Traits • Segmented bodies

  4. Traits • exoskeleton

  5. Traits • Ventral nerve cord

  6. Traits • Open circulatory system

  7. Traits • Bilateral symmetry

  8. Traits • cephalized

  9. Traits • Complete digestive system with glands

  10. Exoskeleton • On the outside – contains chitin which is flexible, tough, and relatively light weight

  11. Advantages • Good protection • Waterproof • Good muscle attachment

  12. Disadvantages • Heavy • Limits movement • Must molt it to grow

  13. Molting

  14. Molting

  15. Molting

  16. Classes within the Arthropods Arthropods Crustacea Chilopoda Insecta Diplopoda Arachnida

  17. 5 classes of arthropods Crustacea 2 5 pairs gills crabs shrimp lobster

  18. 5 classes of arthropods Arachnida 2 4 pairs book lungs spiders scorpions ticks, mites

  19. 5 classes of arthropods Insecta 3 3 pairs trachea beetles grasshoppers butterflies

  20. 5 classes of arthropods Diplopoda many segments 2 pairs per segment trachea millipedes

  21. 5 classes of arthropods Chilopoda many segments 1 pair per segment trachea centipedes

  22. 5 classes of arthropods

  23. Biological Success • Passing on your genes

  24. Indications of success • Number of species • Been around for so long • Adapted to so many environments

  25. Reasons for arthropod success • Exoskeletons • High reproductive rate • Short generation time • Size (small) • flight

  26. Chilopoda • centipedes

  27. Chilopoda • 1 pair legs/segment

  28. Chilopoda • Flattened bodies with legs to the sides

  29. Chilopoda • Carnivores with venomous claws

  30. Only one human death has ever been recorded - from a bite on the head of a young child by a large centipede on a Pacific island

  31. House and garden centipedes

  32. Giant centipede

  33. Diplopoda • millipedes

  34. Diplopoda • 2 pair legs/segment

  35. Diplopoda • Rounded bodies with legs more underneath

  36. Diplopoda • Herbivores with no claws

  37. Millipede defense Can secrete poisonous fluids from pores on their sides

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