Aquatic insects by HC121104201937

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									IB10927 Aquatic insects
April 1, 2009, Pages 259-270
l. True or false: All aquatic insects are descended from terrestrial forms.

2. Name two orders in which all immature stages are aquatic.
   Name two other classes of arthropods with aquatic representatives.

3. Which of the following orders do not have any aquatic representatives?
  a. Hymenoptera                    c. Lepidoptera
  b. Diptera                        d. None of the above

4. Match the method for obtaining oxygen with the aquatic insect
siphon               diving beetle

tracheal gill          aquatic beetle eggs and water scavenger beetles

physical gill          immature stoneflies and mayflies

plastron               rat-tailed maggot

diffusion              gerrids and gyrinids

surface-skating        glassworms

5. What function other than respiration do the rectal gills of dragonflies serve?

6. Describe two places where you can find hydrofuge hairs.
a.                                  b.

7. Oxygen makes up a higher percentage of atmospheric gas under water than it does
above the water surface. How does this arrangement help a physical gill to function?

8. Correct this statement: The gas present in greatest concentration in a physical gill is
oxygen.

9. Why are bloodworms called bloodworms and where are they found?

10. How do glassworms regulate their buoyancy?
  How do Buenoa backswimmers regulate their buoyancy?

11. Why are the back legs of waterboatmen and backswimmers elongate, flattened, and
equipped with long, fine hairs?

12. How do fairyflies “fly” underwater?
13. Under what circumstances does “holding on” become problematical for aquatic
insects?

14. How does unusual eye structure equip whirligig beetles for life on the surface of the
water?

15. How do water striders communicate?

16. True or false: Aquatic insect pheromones are highly volatile.

17. Who produces mirasorvone? What function does it serve? For whom is it named?

18. True or false: Aquatic insects generally don’t rely on sound production for
communication

19.What is the common name for pestiferous psychodids?

								
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