1. Exoskeleton Have a partner roll a piece of cardboard around your writing arm. Make sure it covers your elbow Have your partner put three pieces of tape around the tube to hold it close together – one at each end and one in the middle With the Tube in place try to write your name. Try to scratch your head.

2. Try This Simon Says Why do their skeletons need joints?

3. DO NOW Pick up papers on the chair Read over the crayfish activity Answer on the Lab –What is the difference between an arthropod and a mollusk? 10 o Clock Buddies

4. Agenda Discovery Notes Tick Brochures (?)

5. Crayfish Dorsal SideVentral Side

6. Arthropods Science 7 Mr. D

7. Arthropods Characteristics – Phylum: Arthropoda –Largest group of animals –Have jointed appendages which include legs, antennae, claws, wings, and pincers –Have bilateral symmetry, segmented bodies, exoskeletons, a body cavity, a digestive system with two openings and a nervous system –Most have separate sexes and reproduce sexually –Open circulatory system –Use air tubes, book lungs, and gills to obtain oxygen

8. Arthropods Body Segments –Bodies of these animals are divided into segments similar to segmented worms –Some have many segments, others have segments that are fused together to form body regions Exoskeleton –A hard outer covering that supports and protects the internal body and provides places for muscle to attach. –Doesn’t grow as the animals does, it is shed and replaced during a process called molting

9. What are they Crustaceans Centipedes Millipedes Spiders and their relatives Insects

10. Crustaceans Have one or two pair of antennae and mandibles, which are used for crushing food. Most live in water, but some live in moist environments on land—such as pill bug. Have five pair of legs, first pair of legs are claws for catching and holding food.

11. Crustaceans Swimmerets are appendages on the abdomen which help in movement and are used in reproduction; also force water over the gills used in O 2 and CO 2 exchange If a crustacean loses an appendage it can regenerate it

12. Who are they? Crabs Lobsters Barnacles Shrimp

13. Centipedes & Millipedes Have long bodies and many segments, exoskeleton, jointed legs, antennae and simple eyes. Found in damp environments Reproduce sexually Make nests for eggs and stay with them until they hatch. Centipedes are predators Millipedes feed on decaying plant matter.

15. Meet the Arachnids Spiders Scorpions Ticks Mites

16. Arachnids Have two body regions –Cephalothorax and an abdomen Four pairs of legs and no antennae Many are adapted to kill prey with poison glands, stingers, or fangs Some are parasites

17. Arachnids Scorpions –Have sharp, poison filled stinger at the end of abdomen. –Have a well-developed appendages which they can grab their prey. Spiders –Can’t chew their food, release enzymes into prey to digest it—then suck the predigest liquid into its mouth. –Have book lungs where O 2 and CO 2 are exchanged.

19. Arachnids Mites & Ticks –Most are parasites –Ticks have specialized mouthparts to remove blood from the host. –Ticks often carry disease such as Lyme disease.

23. Value of Arthropods A source of food Agriculture would be impossible without bee pollination Useful chemicals are obtain from some arthropods Important part of ecological community

24. Origin of Arthropods Some fossils are more than 500 million years old Scientist hypothesized that arthropods probably evolved from an ancestor of segmented worms because they have body segments The hard exoskeleton and walking legs allowed arthropods to be among the first animals to live successfully on land

25. Video http://www.youtube.com/watch?v=ySXCdcnK Bgg# http://www.youtube.com/watch?v=ySXCdcnK Bgg# http://www.youtube.com/watch?v=2N0lfprZ5 iU http://www.youtube.com/watch?v=2N0lfprZ5 iU

26. Activity Design a series of signs to be used along hiking trails in national parks to remind hikers of ways to protect themselves from ticks

27. DO NOW Take out your homework and Notesheet Answer this question – How are arthropods different from sponges and cnidarians? Agenda –Finish lecture –Insects –Zebra Mussels