1. Arthropods
Chapter 10

2. Arthropods
1. What phylum do spiders, grasshoppers, lobsters and centipedes all belong to?
ARTHROPODA

3. Arthropods 2. “arthros” mean “jointed”
3. “podos” means “foot” or “leg”

4. Molting Molting: Shedding of the exoskeleton
Insects shed their outer skeleton to grow
Skin not flexible like ours

5. Characteristics of Arthropods
4. Arthropods share four main characteristics:
Exoskeleton (or outer shell)
Prevents evaporation
of water
ii. Used for protection

6. Characteristics of Arthropods
4. Arthropods share four main characteristics:
B. Segmented Bodies
Arthropods can have up to three sections
Head, Thorax and Abdomen

7. Three Body Sections

8. Characteristics of Arthropods
4. Arthropods share four main characteristics:
C. Jointed Appendages
Examples: Legs, wings and arms.
Give animal flexibility

9. Characteristics of Arthropods
4. Arthropods share four main characteristics:
D. Diversity
i. Scientists have discovered over one million species

10. Crustaceans 5. Crustaceans share three main body structure features:
a. Two or three body sections
b. Five or more pairs of legs
c. Two pairs of antennae

11. Used to capture prey and to defend itself
Crustaceans
6. What are chelipeds used for?
Used to capture prey and to defend itself

12. Located beneath the shell of the crustacean
Obtaining Food and Oxygen
7. Crustaceans obtain oxygen by gills.
Located beneath the shell of the crustacean

13. Obtaining Food and Oxygen
8. Crustaceans obtain food by:
Scavengers: Eats dead plant and animals
Herbivores: Eating plants
Predators: Eating animals they have killed

14. Crustacean Life Cycle
9. Most crustaceans begin theirs lives as microscopic, swimming larvae.

15. Metamorphosis
10. The change in shape and habits of an insect as it grows into an adult.

16. Metamorphosis

17. Arachnids 11. Arachnids are arthropods with: a. Two body sections
b. Four pairs of legs
c. No Antennae

18. 12. Some examples of arachnids include ticks, mites and spiders.

19. 13. All spiders are carnivores.
ARACHNIDS
13. All spiders are carnivores.

20. Centipedes & Millipedes
14. All centipedes and millipedes have:
Two body sections
One pair of antennae
Long abdomen

21. Centipedes & Millipedes
15. What’s with the names?
“millipede” means “thousand feet”
“centipede” means “hundred feet”
NO SIGNIFIGANCE!

22. Insects 16. Body Structure: All insects… Three body sections
Six legs (3 pairs)
One pair of antennae
Usually one or two pairs of wings

23. Insects 17. Three sections of insect body: a. Head b. Thorax
c. Abdomen

24. Insects Body Sections Thorax Head Thorax
18. What’s being described?
Internal organs found in
Where legs are attached
Includes sense organs
Small holes for breathing
Where wings are attached
Abdomen
Thorax
Head
Abdomen
Thorax

25. Insects
19. An insect’s mouthparts are adapted for a highly specific way of getting food.
20. Examples:
1. Coiled up tube
2. Sponge like tongue

26. Insects 21. Chewing mouth parts can be found on:
Grasshoppers, dragonflies and ant.

27. The change in shape and habits of an insect as it grows into an adult.
Metamorphosis
The change in shape and habits of an insect as it grows into an adult.

28. Complete Metamorphosis
Insect is COMPLETELY changed

29. Step #4: Insect
Fully developed
Step #1: Egg laid
Step #3: Pupa formed
Step #2: Egg hatches into larva

30. Incomplete Metamorphosis
Insect looks like miniature adult

31. Step #1: Eggs laid
Step #4: Insect
Fully equiped
Step #3:
Nymph
grows and sheds
exoskeleton
Step #2: nymph hatches and grows

32. Metamorphosis
24. Nymph: Young form of adult with incomplete metamorphosis; miniature adult
25. Larva: The young form of an insect with complete metamorphosis

33. Same mouthparts just smaller
Metamorphosis
26. Nymph’s typically eat the same food as adult because they look just like the adult.
Same mouthparts just smaller

34. Metamorphosis
Complete
Gradual