1. Arthropods Most successful phyla 1,000,000 species named
Most diverse phyla
2/3 of all named species are arthropods. 80% of arthropods are insects. ½ of named insects are beetles.1,000,000 named species.

2. Arthropod Diversity
Crusteacea-1st appendage is antennae, 2nd is madibles for mouth parts, basically they are biramous. They have gills for respiration.

3. Arthropod Diversity
Uniramia-1st appendages are antennae, 2nd are mandibles for mouthparts. Tracheal respiratory system. Malpighian tubules, uniramous legs. myriapods and insects. ½ of all named insects are beetles. 80% of all named arthropods are insects.

4. Arthropod Diversity
Chelicerata-1st appendage are Chelicerae-pincerlike mouthparts. Book lungs, trachaea.

5. Characteristics of Arthropods
Coelomates
Mesoderm lining gut and Ectoderm
Bilateral Symmetry
Protostomes
Blastopore becomes the mouth
These are characteristics that we have seen in Annelids (earthworms and leeches), Mollusca(clams, snails, octopi.

6. Characteristics of Arthropods
Segmentation
Some fused into tagmata
Cephalization
Open Circulation
Ventral Nerve Cord
These are characteristics that we have seen in Annelids (with the exception of the closed circulatory system) Go back to the pictures and have students pick out characteristics that are new that they observe.

7. Characteristics of Arthropods
Jointed Appendages
Arthropod means “jointed feet”
Antennae, Mouthparts, Legs, Wings
One reason they are so successful
Exoskeleton
Made of chitin, lipids, and proteins
Sometimes calcium carbonate
Provides protection
Another reason they are so successful
Compound Eye
Molting
These are new characteristics that we have seen. What advantages to they serve? In other words, why did they develop?

8. Jointed Appendages Grasping Sensory Feeding Crawling Swimming
Reproduction
Defense
What would we do without our jointed appendages(knuckles, elbows, knees, etc.?

9. Exoskeleton Protects from drying out Protects from water pressure
Protects from predators
Protects from injury
Chitin and Protein
Strong and Flexible
Limits Size
Talk about molting.

10. Compound Eyes Most arthropods have them Individual light sensors
Individual lenses
Not every arthropod has compound eyes. Simple eyes are for distinguishing between darkness and light. It helps stabilize the insect during flight by identifying the horizon.

11. Compound Eyes

12. Arthropod Classification
Arthropods
Trilobita
Chelicerata
Crustacea
Uniramia
EXTINCT
We are going to revisit the pictures we saw earlier and identify them as one of these phyla.

13. Prediction Activity
Groups

14. Chelicerata
Include turantulas, spiders, mites, ticks, and horshoe crabs

15. Crustacea
Includes lobsters, crabs, shrimp, hermit crabs, scorpions, crayfish

16. Uniramia
Includes millipedes, centipedes, and all insects

17. Characteristics of Chelicerates
1st Appendage is the Chelicera
Book Lungs
Malpighian tubules
Trachea
Spiders, turantulas, mites, ticks, horshoe crabs

18. Characteristics of Crustacea
1st appendage is the antennae
2nd appendage is the mandible
Gills for respiration
Biramous legs
Includes lobsters, crabs, shrimp, hermit crabs, scorpions, crayfish

19. Characteristics of Uniramia
1st Appendages are antennae
2nd Appendages are mandible
Tracheal respiratory system
Malpighian tubules
Uniramous legs
Includes millipedes, centipedes, and all insects

20. Comparison of the Subphyla
Chelicerata
Crustacea
Uniramia
Mouthparts
Chelicera
Mandible
Mandibles and Maxillae
Antennae
None
2 pair
1 pair
Sensory Organs
Pedipalps
Antennules and Antennae
Body Regions
Cephalothorax
Abdomen
Head, Thorax,
The characteristics that Chelicera, Crustacea, and Uniramia that they have in common are what make them all arthropods. Here are the characteristics that make them different.

21. Where Do I Belong?

22. Where Do I Belong?

23. Where Do I Belong?

24. Where Do I Belong?

25. Where Do I Belong?

26. Where Do I Belong?