1. Phylum Arthropoda “jointed foot” animals
Examples: spiders, insects, centipedes, millipedes, crustaceans

2. Traits
Jointed appendages

3. Traits
Segmented bodies

4. Traits
exoskeleton

5. Traits
Ventral nerve cord

6. Traits
Open circulatory system

7. Traits
Bilateral symmetry

8. Traits
cephalized

9. Traits
Complete digestive system with glands

10. Exoskeleton
On the outside – contains chitin which is flexible, tough, and relatively light weight

11. Advantages
Good protection
Waterproof
Good muscle attachment

12. Disadvantages
Heavy
Limits movement
Must molt it to grow

13. Molting

14. Molting

15. Molting

16. Classes within the Arthropods
Crustacea
Chilopoda
Insecta
Diplopoda
Arachnida

17. 5 classes of arthropods Crustacea 2 5 pairs gills crabs shrimp lobster
Name
Body Regions
Legs
Respiration
Examples
Crustacea 2
5 pairs
gills
crabs
shrimp
lobster

18. 5 classes of arthropods Arachnida 2 4 pairs book lungs spiders
Name
Body Regions
Legs
Respiration
Examples
Arachnida 2
4 pairs
book lungs
spiders
scorpions
ticks, mites

19. 5 classes of arthropods Insecta 3 3 pairs trachea
Name
Body Regions
Legs
Respiration
Examples
Insecta 3
3 pairs
trachea
beetles grasshoppers butterflies

20. 5 classes of arthropods Diplopoda many segments 2 pairs per segment
Name
Body Regions
Legs
Respiration
Examples
Diplopoda
many segments
2 pairs
per segment
trachea
millipedes

21. 5 classes of arthropods Chilopoda many segments 1 pair per segment
Name
Body Regions
Legs
Respiration
Examples
Chilopoda
many segments
1 pair
per segment
trachea
centipedes

22. 5 classes of arthropods Name Body Regions Legs Respiration Examples
Crustacea 2
5 pair
Gills
Crabs
Shrimp
lobster
Arachnida
4 pair
Book lungs
Spiders
scorpions
Ticks and mites
Insecta 3
3 pair
Trachea
grasshoppers
beetles
Butterflies
Diplopoda
Many segments
2 pair per segment
millipedes
Chilopoda
1 pair per segment
centipedes

23. Biological Success
Passing on your genes

24. Indications of success
Number of species
Been around for so long
Adapted to so many environments

26. Reasons for arthropod success
Exoskeletons
High reproductive rate
Short generation time
Size (small)
flight

27. Chilopoda
centipedes

28. Chilopoda
1 pair legs/segment

29. Chilopoda
Flattened bodies with legs to the sides

30. Chilopoda
Carnivores with venomous claws

31. Only one human death has ever been recorded - from a bite on the head of a young child by a large centipede on a Pacific island

32. House and garden centipedes

33. Giant centipede

34. Diplopoda
millipedes

35. Diplopoda
2 pair legs/segment

36. Diplopoda
Rounded bodies with legs more underneath

37. Diplopoda
Herbivores with no claws

38. Millipede defense
Can secrete poisonous fluids from pores on their sides