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Joint-Legged Animals

Joint-Legged Animals. SBI 3U. Joint-Legged Animals. Phylum: Arthropod a. Ancestors. May have evolved from annelid worms Why?. Phylum Arthropoda. Segmented body Jointed legs Exoskeleton Hemocoel Coelom Gas exchange – gills & trachea. Moulting in Arthropods.

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Joint-Legged Animals

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  1. Joint-Legged Animals SBI 3U

  2. Joint-Legged Animals • Phylum: Arthropoda

  3. Ancestors • May have evolved from annelid worms • Why?

  4. Phylum Arthropoda • Segmented body • Jointed legs • Exoskeleton • Hemocoel • Coelom • Gas exchange – gills & trachea

  5. Moulting in Arthropods • Exoskeleton limits size • Exoskeleton made of chitin  protects animal and resists drying • Rigid exoskeletons prevented efficient locomotion  why? And what modifications were made to provide for more efficient locomotion?

  6. Rigidity of Exoskeleton • No longer needed coelom for body shape • Coelom shrank

  7. Rigidity of Exoskeleton • Reduced arthropod’s ability for gas exchange • Aquatic arthropods  gills • Land arthropods  trachae

  8. Trachea

  9. Rigidity of Exoskeleton • Hindered growth • Moulting

  10. Open Circulatory System • Hemocoel • Ancient annelids developed blood instead of body fluid

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