1. Entomology

2. Entomology What is Entomology?
Entomology is the study of insects. Insects are always around us. Scientists called entomologist spend most of their time studying insects.

3. Entomology
What is the average amount of insects that are on the earth’s surface?
More than 750,000 species of insects have been identified.

4. Entomology Are all insects harmful to humans?
No. Only about 10,000 are harmful to humans.

5. Entomology Classification of insects:
Different levels of classifying insects:
Kingdom
Phyla
Class
Order
Family
Genus
Species

6. Entomology The highest classification level is the kingdom.
The most specific classification is the species level.
Organisms are classified by genus and species.
This is called a binomial nomenclature.

7. Entomology Six orders of insects: Orthoptera - grasshopper and locust
Hemiptera -leaf hoppers and plant bugs
Lepidoptera – moths and butterflies
Homoptera – aphids
Thysanoptera - thrips
Coleoptera - beetles (the largest group of the insect orders)

8. Entomology How are insects grouped?
Insects are grouped by their mouth parts.

9. Entomology Six different mouth parts Sponging Rasping- sucking
Siphoning
Chewing-lapping
Chewing
Piercing- sucking

10. Entomology
Insects have no internal skeleton. They rely on a hard outer coating called exoskeleton to protect the inner organs and support the body.

11. Entomology What are the parts of an insect? Three parts to an insect
Head
Thorax
Abdomen

12. Entomology
Head
The head has a pair of compound eyes and two sensory appendages called antennae.

13. Entomology
Thorax
The thorax is divided into three segments. Three pairs of legs are attached to the thorax.

14. Entomology
Abdomen
The abdomen is attached to the thorax.

15. Entomology Insects will complete one of three different life cycles.
No Metamorphosis - no change
Incomplete Metamorphosis - gradual change
Complete Metamorphosis - complete change

16. Entomology Incomplete Metamorphosis Egg Early nymph (no wings)
Late nymph (wings developing)
Adult

17. Entomology
Complete Metamorphosis
Egg
Larva
Pupa
Adult

18. Entomology What is a larva?
A larva is a young insect with a soft tubular body and looks very much like a worm.

19. Entomology What is a pupa?
The pupa stage is a dormant stage where the larva changes into an adult.

20. Entomology What are Phytophagous insects?
Phyto means plant and phagous means eating. Whenever a plant is eaten, it is damaged in terms of growth and productivity.