1. PHYLUM ARTHROPODA

2. Overview One of the most diverse phyla
First arthropod appeared 600 millions years ago, in the sea.

3. Vocabulary review for all Arthropods (Ask Students to Define each of the following Vocabulary words)
Triploblastic
High levels of Cephalization (sophisticated heads)
Open circulatory systems
Ceolom
Metamorphosis

4. 3 Main Characteristics of Arthropods
YOU TELL ME!
Exoskeleton
Jointed Appendages (arms and legs)
Segmented Body

5. Does a caterpillar have an exoskeleton?
YES. It is just more flexible and leathery than other exoskeletons

6. EXOSKELETON Made of Chitin (carbohydrates) Same material as your nails
Major evolutionary advancement but has its advantages and disadvantages.

7. Advantages and Disadvantages of an Exoskeleton (Hand out reading assignment-”Skeletons” and go to next slide when students are finished)

8. The Good
The Bad
Protection
Waterproof (prevents desiccation-water loss)
Can help in movement
Require molting as they do not grow with the creature (high energy, vulnerability)
Size limiting

9. This coconut crab is about as big as creatures with exoskeletons are thought to get on land

11. FEEDING ALL METHODS! Herbivores (e.g. grasshopper) Carnivores
(e.g. crabs, spiders, praying mantis, Scorpions)
Parasites (e.g. ticks, mites)
Filter feeders
(marine- E.g. Krill)
Detritus feeders/ Scavengers

12. INTERNAL TRANSPORT (Circulatory)
Open Circulatory System with well-developed heart
How it works:
Heart Contract
pump bloods through arteries and vessels
blood leaves tissue & go into sinuses (spaces)
blood collect in cavity near heart

13. Spiracles let air in and out, Click video link please
Video: ..\..\..\Lesson Videos\Biology 11\Arthropods and Echinoderms\6. Insect circulatory system.flv

14. Molting (all arthropods)
To shed exoskeleton

15. Metamorphosis Video
What's the difference between complete and incomplete metamorphosis?
Have students define metamorphosis and give examples
..\..\..\Lesson Videos\Biology 11\Arthropods and Echinoderms\Complete vs. Incomplete Metamorphosis.flv
Ask students what are some advantages of complete metamorphosis?