1. 10.2 Arthropods

2. POINT > Describe characteristics of arthropods POINT > Define exoskeleton and molting POINT > Identify the 4 largest groups of arthropods POINT > Define antenna

3. Arthropods have segmented bodies Arthropods have an external skeleton (exoskeleton) Arthropods have jointed appendages

4. An exoskeleton is a hard covering on the outside of the body Exoskeleton advantages: 1. Hard covering protects organs and is defense against predators 2. The exoskeleton is waterproof, keeps water inside the animal

5. An exoskeleton is a hard covering on the outside of the body Exoskeleton disadvantages: 1. The exoskeleton does not grow. As the animal gets bigger it must lose its exoskeleton and make a new one. This makes the animal vulnerable to predators 2. An external skeleton limits the size of the organism; these animals can never get very big

6. CHECK: What are 3 characteristics of arthropods? What is an exoskeleton? What is an advantage to an exoskeleton? What is a disadvantage to an exoskeleton?

7. Molting is the process of losing the old exoskeleton and making a new one The animal is soft and vulnerable during this time

8. The 4 largest groups of arthropods: Crustaceans Arachnids Centipedes and millipedes Insects

9. CHECK: What is molting? What are 4 groups of arthropods?

10. 1.Crustaceans: most live in water 2-3 body segments 5 or more pairs of legs 2 pairs of antennae Crayfish, lobster, crab, shrimp, pill bug are examples

11. http://www.youtube.com/watch?v=azNtLNpeLac

12. CHECK: What are 2 characteristics of crustaceans? What are antennae?

13. 2. Arachnids: most live on land 2 body sections 4 pairs of legs No antennae Spiders, mites, ticks, scorpions

14.  http://www.youtube.com/watch?v=WUB lOVM4AX0 http://www.youtube.com/watch?v=WUB lOVM4AX0  http://www.youtube.com/watch?v=hoB m_Hgjc6Y http://www.youtube.com/watch?v=hoB m_Hgjc6Y  http://www.youtube.com/watch?v=Rsd2 i-qFHK4 http://www.youtube.com/watch?v=Rsd2 i-qFHK4  http://youtu.be/ifOYR0aS9xM http://youtu.be/ifOYR0aS9xM

15. 3. Centipedes and millipedes: all live on land Many body segments Many pairs of legs Centipedes – predators, inject venom, one pair of legs per segment Millipedes – scavengers, 2 pairs of legs per segment

16.  http://youtu.be/8CL2hetqpfg http://youtu.be/8CL2hetqpfg  http://youtu.be/nanX_k6lNS4 http://youtu.be/nanX_k6lNS4

17.  http://youtu.be/J8Ey_tAqAwQ http://youtu.be/J8Ey_tAqAwQ

18. 4. Insects 3 body sections 3 pairs of legs 1 pair of antennae Only arthropod group that has flyers Ex. Flies, butterflies, bees, ants

19.  http://www.youtube.com/watch?v=weQ 0yrl4ypE http://www.youtube.com/watch?v=weQ 0yrl4ypE  http://www.youtube.com/watch?v=AxH 4tFcZazU http://www.youtube.com/watch?v=AxH 4tFcZazU

20. Read Pages 335-342 Section Assess #1-2 Page 342 GRAS 10.3 Pages 141-144