1. Objective: Class Arachnida

2. Arachnida Two body sections 1. cephalothorax: fused head and thorax 2. abdomen 4 pairs of legs

3. 2 pairs of mouthparts chelicerae: fanglike, paralyze prey pedipalps: used to manipulate prey

4. Body Characteristics Malphighian tubules:. Reduce water loss; absorb water from waste book lungs: exchange gases with atmosphere

5. Spiders Hunters Search for prey tarantulas Weavers “sit-and-wait” Weave a web from silk glands spinnerets: organs that spin fibers All produce silk, but not all produce webs

6. Scorpions Nighttime hunters Live in deserts Pedipalps are pincers Used for defense and prey Poisonous stinger

7. Mites and Ticks Parasites Plants or animals Ticks! Lyme Disease Sucking mouthparts and claws to hold onto host Free-living WARNING! Graphic Pictures on next slide

8. Arachnid Bites Day 6 Day 10 Brown Recluse Bite Lyme Disease (severe)

9. Crustacea

10. Decapods Means “ten legs”

11. Decapod Body Cephalothorax and abdomen Exoskeleton: Made of calcium carbonate carapace: shield that covers back of cephalothorax mandibles: mouthparts

12. Barnacles

13. Copepods Krill Food for whales and fish

14. Isopods Terrestrial Pill bugs (wood lice) “rolley-polley”

15. Class Insecta

16. Characteristics Head, thorax, abdomen Wings Extension of exoskeleton Malpighian tubules Trachael system no book lungs Compound eyes

17. Insect Success Ability to Fly Escape predators Find food Find mates New habitats

18. Metamorphosis Immature to mature Incomplete(Simple) Metamorphosis Juvenile(nymph) to adult Juvenile smaller, no wings Complete Metamorphosis Larva and adult different

20. Class Diplopoda Millipedes 2 pair legs per segment Eat decaying matter

21. Class Chilopoda Centipedes Pair of legs per segment Predators