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Arthropods

Arthropods. Chapter 28. Characteristics of Arthropods. 1. Arthropods share four main characteristics: A . Segmented Bodies Arthropods can have up to three sections Head, Thorax and Abdomen. Three Body Sections. Characteristics of Arthropods.

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Arthropods

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  1. Arthropods Chapter 28

  2. Characteristics of Arthropods • 1. Arthropods share four main characteristics: • A. Segmented Bodies • Arthropods can have up to three sections • Head, Thorax and Abdomen

  3. Three Body Sections

  4. Characteristics of Arthropods • 1. Arthropods share four main characteristics: • B. Exoskeleton (or outershell) • Preventsevaporation • of water • ii. Used for protection

  5. Characteristics of Arthropods • 1. Arthropods share four main characteristics: • C. Jointed Appendages • Examples: Legs, wings and antennae • Give animal flexibility

  6. Arthropods • 2. Shrimp, spiders and millipedes are all in the phylum ARTHROPODA

  7. Arthropods • 3. Exoskeleton: Tough, external covering that is a suit of armor to protect the animal. • 4. Purpose = Protection!

  8. 5. Arthropod literally means… • “arthros” mean “jointed” • “podos” means “foot” or “leg” • Example: Wing, Legs and Antennae

  9. Obtaining Food and Oxygen • 6. Arthropods obtain food by: • Scavengers: Eats dead plant and animals • Herbivores: Eating plants • Predators: Eating animals they have killed

  10. Circulatory System • 7. Arthropods have an open circulatory system. • Blood leaves the blood vessels and moves through cavities. • Not the same as earthworms!

  11. 8. Molting • Molting: Shedding of the exoskeleton • Insects shed their outer skeleton to grow • Skin not flexible like ours

  12. Classification • 9. Arthropods are classified based on the number and structure of their body segments and appendages

  13. Groups of Arthropods

  14. What is it?

  15. Crustaceans • 11. Function of parts of crustaceans • Cephalothorax: Fusion of the head with the thorax; houses most internal organs • Carapace: Exoskeleton that covers the cephalothorax • Manible: Mouthpart adapted for biting and grinding food • Chelipeds: Large claws that are modified to catch, pick up, crush and cut food • Swimmerets: Flipper-like appendages for swimming

  16. Spiders and Their Relatives • 12. Some Chelicerata include… • Horseshoe crabs, spiders, mites, ticks and scorpians

  17. 13. Chelicerae vsPedipalps • Both are appendages that are attached near the mouth and adapted as mouth parts • Chelicerae contain fangs and used to stab and paralyze prey • Pedipalps are longer and usually modified to grab prey

  18. Insects and Their Relatives • 14. Centipedes, millipedes and insects belong to the subphylum Uniramia.

  19. Centipedes & Millipedes • 15. What’s the difference? • “millipede” means “thousand feet” • “centipede” means “hundred feet” • NO • SIGNIFIGANCE!

  20. Insects • 16. Three parts of an insect: • Head • Thorax • Abdomen Appendages found on same section on all insects

  21. Insects • 17. Adaptations to respond to stimuli • Compound eye to detect changes in color and motion • Chemical receptors for taste and smell on mouthparts • Chemical receptors also on their antennae and legs

  22. Adaptations for Feeding • 18. Insects have various mouth parts in order to get food in a way that best fits them

  23. Metamorphosis Complete Gradual

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