1. Insects, crustaceans, spiders, scorpions, Oh My!
Arthropods

2. In every part of the world!
Monarch Butterfly on milkweed

3. Orb Weaver Spider, Giant Centipede (Arizona)

4. Arthropod = Jointed Foot (Appendage)
Poda = Foot
Arthro = Joint
Arthropod = Jointed Foot (Appendage)

5. Bilateral symmetry

6. Distinguishing Characteristics
Tough Exoskeletons
Jointed Appendages
Segmented Bodies

7. Exoskeleton Outer Skeleton Protects Organs from Injuries
Waxy Coating Allowing for Waterproofing
Disadvantages: heavy, growth

8. Jointed appendages Moveable Extensions of Body Allow for Movement
May be Modified for Breathing, Feeding,
or Flying
Disadvantages: heavy, growth

9. Segmented Bodies Specialized Segments Each class has specific segments
Disadvantages: heavy, growth

10. Other Characteristics
True Coelom (internal body cavity)
Open Circulatory System
Respiration through
body surfaces, gills, tracheae or lungs
Demonstrate Cephalization
Arteries with no capillaries

11. Classification of aRTHROPODS

12. Class aRACHNIDA Spiders, scorpions, mites Cephalothorax and abdomen
4 pairs of legs
Fang like claws, spinneretes for creating webs
Wolf Spider, Black Widow

13. Class Diplopoda Millipedes 2 pairs of legs on each body segment
Eat decaying plant material

14. Class Chilopoda Centipedes 1 pair of legs on each body segment
Feed on insects, earthworms, slugs

15. Class crustacea crayfish, lobsters, crabs, pill bugs, barnacles
cephalothorax
2 pairs of antennae
mainly aquatic
Exoskeleton made of calcium carbonate

16. Class insecta most successful land arthropods head, thorax, abdomen
each thoracic segment has a pair of legs (some may have wings)
3 pairs of mandibles

17. And the Star of the Week...