Arthropods

28-1 Introduction to Arthropods

1. Arthropods have a ______________________ body, a tough exoskeleton, and ______________________ appendages.
2. What is the exoskeleton? ________________________________________________________
What is it made of? __________________________________
3. Structures that extend from the body, such as legs and antenna are called _________________________
4. Identify this organism (see fig 28-2)
____________________________

5. The evolution of arthropods has led to [ greater / fewer ] body segments.
6. Most arthropods breathe through a network of _______________________tubes.
7. What are spiracles? ____________________________________________
8. How does a spider respire? ______________________________
How does a lobster respire? ______________________________
9. What type of circulatory system do arthropods have? ___________________
10. Saclike organs that extract waste from the blood of arthropods are called ___________________________________
11.Do arthropods have a brain? _____________ What is ganglia? __________________________
12. When muscle cells contract, they become [ longer / shorter ].
13. When an arthropod outgrows its exoskeleton, it undergoes periods of ______________________________.
14. Why is molting dangerous for arthropods? ______________________________________________

28-2 Groups of Arthropods

15. How are arthropods classified? _________________________________________________________
16. Name two crustaceans: ___________________________________________________
17. What type of mouthparts do crustaceans have? _________________________________
18. In crustaceans, the head and thorax are fused to form the ________________________________________
19. What is the carapace? _________________________________________________
20. _________________________ are a group of crustaceans that have five pairs of legs.
21. The first pair of legs in a lobster has claws and is called the ________________________________
22. Appendages located along the abdomen of a crayfish or lobster are called _________________________________
23. What crustacean is sessile? ____________________________________

24. Label the Crayfish

Spiders and Their Relatives

25. Name two chelicerates: _______________________________________________________
26. Do chelicerates have antennae? _________________
27. What pair of appendages have fangs? ___________________________________________
Which pair of appendages are used to grab prey? ___________________________________
28. Name an aquatic chelicerate: ________________________________________________
29. Name two animals in the class Arachnida: ______________________________________________
30. Since spiders cannot chew their food, how do they digest it? __________________________________
31. What organs contain silk glands? _________________________________________
32. What arachnid can spread Lyme Disease? ________________
33. What arachnid has a venomous stinger? _____________________

Analyzing Data (p. 724)

34. What are two symptoms of Lyme disease? ___________________________________
35. Is Illinois a state with an incidence of Lyme disease? ____________ What about New Mexico? ___________

Insects and Their Relatives

36. Centipedes, millipedes, and insects belong to what SUBPHYLUM? _____________________________
37. What do centipedes eat? _______________________________
38. Centipedes belong to the Class _________________________;
Millipedes belong to the class _______________________
39. What do millipedes eat? ____________________________________
40. What do millipedes do when they are disturbed? ______________________________________________

Matching: Match the characteristic to its arthropod group

A. Crustaceans | B. Arachnids | C. Centipedes | D. Millipedes

1. ____ Many segments, two pairs of legs per segment
2. ____ Chelicerae and pedipalps
3. ____ Two body segments, no antennae
4. ____ Two body segments, two pairs of antennae
5. ____ Includes horseshoe crabs and ticks
6. ____ Has chelipeds
7. ____ Many segments, one pair of leg per segment, venomous
8. ____ Includes lobsters, crabs, and crayfish
9. ____ The largest group of arthropods
10. ____ Can spread Lyme disease