1. Arthro = Joint Pod = Foot
Arthropods
Arthro = Joint
Pod = Foot

2. What do these animals have in common?
Tough Exoskeleton (chitin – “ky- tin”)
Jointed Appendages
Segmented body

3. Why an exoskeleton? Protection Support Waterproof Flexible or Hard
Added strength
Anchor point
Waterproof
Prevents water loss

4. Challenges? Exoskeleton (armour) does not grow with the animal
Rigid covering allows movement only at joints

5. Why jointed legs? Strong/light and adaptable
Antennae, claws, legs, wings, flippers … evolve from the same jointed appendages

6. Why might several body segments help in evolution?
Segmentation
Why might several body segments help in evolution?
Each repetitive segment can evolve a unique purpose!

7. Phylum Arthropoda Subphylum Uniramia Insects Chelicerates Crustaceans
Centipedes & Millipedes
Insects

8. Body Plan (insect)

9. Spider Body Plan

10. Crustacean Body Plan