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Arthropods

Arthropods. 5 th Grade. Phylum : Arthropod - “ Arthropoda ” * 4 major groups : . 1) Crustaceans 2) Arachnids 3) Centipedes & Millipedes 4) Insects. DEFINING C haracteristics that arthropods have: (what makes them unique) . In vertebrates –(no backbone)

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Arthropods

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  1. Arthropods 5th Grade

  2. Phylum: Arthropod - “Arthropoda” *4 major groups: 1) Crustaceans 2) Arachnids 3) Centipedes & Millipedes 4) Insects

  3. DEFININGCharacteristicsthat arthropods have: (what makes them unique) • Invertebrates –(no backbone) • Exoskeletons –(external skeleton) • Segmented Bodies • Jointed Appendages • Most haveantenna

  4. Characteristics that arthropods have that they share with other organisms: • Bilateral symmetry • Open circulatory system • One way digestive system (2 openings) • Most reproduce sexually

  5. Exoskeleton: hard outer shell or skeleton

  6. Exoskeleton –Advantages and Disadvantages PROS: • Protects the body • Prevents water from evaporating so the insect does not dry out CONS: Limits movement Have to lose shell and regrow a new one in order to grow

  7. Since their exoskeletons prevent arthropods from moving or growing quickly, what do they use to help them move and grow? *Other body parts help them move: • segmented bodies • jointed appendages Some undergo a process called “molting” Molting = the process of shedding an outgrown exoskeleton and growing a new one that is larger

  8. Adaptations for Movement • Segmented Bodies: • Jointed Appendages:

  9. Molting: the process of shedding an outgrown exoskeleton and growing a new one that is larger

  10. Most arthropods have an antenna • Antenna: an appendage attached to the head that contains sense organs

  11. ALL arthropods have Bilateral Symmetry

  12. ARTHROPODS have an OPEN CIRCULATORY SYSTEM Open Circulatory System Closed Circulatory System

  13. Look for the one way digestive system(2 openings) and the open circulatorysystem

  14. Largest Arthropod Groups

  15. Examples of Crustaceans • Crayfish • Lobster • Shrimp • Pill bug

  16. Examples of Arachnids • Spiders • Mites • Scorpions • Ticks

  17. Examples of Insects • Fly • Butterfly • Ant • Grasshopper

  18. Centipedes and Millipedes

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