1. Phylum Arthropoda

2. General Characteristics
Arthropod = _______________
Largest group of animals
80% of described species
30-50 million species
Most varied

3. General Characteristics Con’t
Metamerism (body divided into segments)
_____________________________
Paired, jointed appendages
Ecdysis-molting (growth)
Open Circulatory System
Complete digestion tract

4. Metamerism (Body Segments)

5. General Characteristics Con’t
Ventral Nervous System
__________________
Metamorphosis
5 Subphylum
Trilobitomorpha, Myriapoda, Chelicerata, Crustacea, Hexapoda

7. Functions of exoskeleton _______________ Minimize H2O loss
Muscle attachment

8. Exoskeleton Structure
Composed of _________________
Epicuticle: outer layer
Water proof
Procuticle: inner layer
Made of chitin

9. Ecdysis (molting)
_____________________________
1. Enzymes digest old exoskeleton
2. New exoskeleton secreted
New exoskeleton is soft
3. Scleratization (hardening)

10. Ecdysis (molting) Molting is important for arthropod growth
Can’t grow in a suit of armor
Is also a dangerous time for arthropods
Typically animals about to molt, will go into hiding just before the process begins

11. _________________________
Changes in body form from larval to adult
Ex. Butterfly, Dragonfly
Reduces competition for food and living space

13. Subphylum Trilobitomorpha
___________________!
All extinct and marine
Body with 3 sections

14. Myriapoda- “many legs” Millipedes, centipedes Paired legs
Subphylum Myriapoda
Myriapoda- “many legs”
Millipedes, centipedes
Paired legs
_______________________

15. Millipedes vs. Centipedes
Herbivorous
Appear to have 2 legs per segment
_____________
Non-venomous

16. Have only 1 pair of legs per segment Faster Venomous
Centipedes
____________
Have only 1 pair of legs per segment
Faster
Venomous

17. Subphylum Chelicerata
Spiders, mites, ticks, scorpions, horseshoe crabs,
Have chelicera- fangs
________________
Cephalothorax
Abdommen

18. _______________
Appendages:
1st pair- chelicera: feeding (often fang-like)
2nd pair- Pedipalps: feeding, locomotion, reproduction

19. Subphylum Hexapoda
INSECTS

20. General Characteristics
Hexapoda = “____________”
Includes the class Insecta
30 million species
27 Major orders
We will only learn 8

21. General Characteristics Con’t
3 pairs of legs
6 total
1 pair of antennae
Most have 2 pairs of wings
______________________
3 part body plan
Head, Thorax, Abdomen

22. Is a unique trait to the insects
Insect Flight
Is a unique trait to the insects
Different insects have wing modifications for specific functions

23. Economic Importance
Parasites
Ticks, fleas
Are considered agricultural pests.
1949-European corn borer caused $349 million in damage to the US corn crop

24. Economic Importance Con’t
Provide goods
Honey
Beeswax
Yummy (to certain cultures)
Silk
Dyes

26. Economic Importance Con’t
Also are vectors for many diseases
Bubonic plague (flea)
Malaria (mosquito)
_________________(mosquito)
African Sleeping Sickness (Tsetse fly)

27. Subphylum Crustacea

28. General Characteristics
Includes crabs, lobsters, crayfish, shrimp, and barnacles
_____________________________
Biramous Appendage: branched Y-shaped appendages

31. General Characteristics Con’t
___________________
Marine and Freshwater
2 or 3 body segments
Head, Thorax, and Abdomen OR
Cephalothorax and Abdomen

32. Reproduction
______________
Few monoecious (hermaphroditc)

33. Females retain eggs until hatching

34. Tasty—people like to consume them _____________
Economic Importance
Tasty—people like to consume them
_____________

35. Ecological Importance
Scavengers-eat dead material
_______________(shrimps, barnacles)