1. Section 1 The Insect World
Chapter 37
Section 1
The Insect World

2. Characteristics Phylum Arthropoda Subphylum Hexapoda Class Insecta
Body divided into three segments: head, thorax, & abdomen
Most are small, some are huge

3. African Goliath Beetle

4. Atlas Moth

5. Characteristics
Entomology- the study of insects and other terrestrial arthropods
Entomologist- person who studies insects

6. Success of Insects Live everywhere in the world except for saltwater
Most have the ability to fly- how does this make them successful?
Light but sturdy exoskeleton
Short lifespan and produce large numbers of eggs

7. Insects & People Insect pests- how do they affect humans?
Fleas- transmit harmful bacteria- plague
Tsetse fly- African Sleeping Sickness
Termites- destroy wood in buildings

9. Insects & Humans Serve as food for numerous species of animals
Pollination
Commercially valuable- honey, wax, silk, etc
Termites help recycle nutrients back into the environment

10. Insect Development Metamorphosis- developmental change Incomplete

11. Incomplete Metamorphosis
Incomplete metamorphosis- nymph hatches from an egg and gradually develops into an adult
Nymph- immature form of an insect that looks like the adult, but it is smaller, and its wings and reproductive organs are undeveloped
EX: GRASSHOPPER

13. Complete Metamorphosis
Complete metamorphosis- insect undergoes two stages of development between the egg and the adult
Example: butterfly

15. Importance of Metamorphosis
Larval and adult stages have different functions and don’t compete for food
Helps survive harsh winters
Example: butterflies and moths spend the winter as pupae encased in cocoons buried in soil

16. Insect Defense Camouflage, venom
Bold, bright colors- poisonous = warning coloration
Mullerian mimicry- dangerous species mimic the warning colors of others
Batesian mimicry- harmless species mimics dangerous species

19. REVIEW!!! Why are insects successful?
List two ways that insects are harmful to society and two ways they are beneficial.
Describe two types of mimicry in insects.