1. Insects
Chapter 10 Section 3

2. Arthropods with three body sections, six legs, one pair of antennae, and usually one or two pairs of wings
Three body sections are the head, thorax, and abdomen
Body Structure

3. Insect’s sense organs found in head (eyes/antennae)
Two large compound eyes
Compound eyes contain many lenses, keen at seeing movement
Body Sections: Head

4. Body Structure: Thorax
Insect’s midsection
Where wings and legs are attached
Only invertebrates that can fly
Can travel long distances to find mates, food, and new places to live
Body Structure: Thorax

5. Body Structure: Abdomen
Internal organs found in the abdomen
Small holes outside of abdomen allow air, which contains oxygen, to enter the body through tubes
Body Structure: Abdomen

6. “If it is living, or if it once was living, some kind of insect will eat it.”
Mouthparts are adapted for a highly specific way of getting food
Obtaining Food

7. Complete metamorphosis Gradual metamorphosis
Begin life as tiny, hard-shelled, fertilized eggs
Either go through…
Complete metamorphosis
Gradual metamorphosis
Life Cycle

8. Complete Metamorphosis
4 different stages: egg, larva, pupa, adult
Insect begins life as a tiny, hard-shelled fertilized egg
The eggs hatch into larvae (usually look like worms)
Larva will then enter next stage and become a pupa, insect is enclosed in a protective covering
Pupa does not eat/barely moves, but it is NOT resting
When development is complete, adult leaves pupal case
Complete Metamorphosis

10. Gradual Metamorphosis
No distinct larval stage
Egg hatches into a stage called a nymph
Nymph: usually looks like the adult insect without wings
Nymph may molt several times before becoming an adult
Grasshoppers, termites, cockroaches, dragonflies
Gradual Metamorphosis