1. Entomology: The study of insects
Modified by Ms. Rouse 2013

2. Entomology How many insects are there?
More than 750,000 species of insects have been identified.
There are more species of insects than all other land animals combined (Biokids, 2013)
Insects are part of a larger group of organisms known as arthropods
Arthropods include:
Spiders
Scorpions
Crabs
Lobsters
Bugs

3. Entomology Arthropods What separates insects from other Arthropods?
Have rigid external skeletons
Have legs that are jointed
What separates insects from other Arthropods?
3 Clear and Distinct Body segments (in adult stage)
Head, Thorax, Abdomen
6 legs – attached to the Thorax
May have wings (only arthropods with wings)
Lay Eggs
Go through either complete or incomplete metamorphosis

4. Entomology
Insect or Other Arthropod?

5. Insect Characteristics
Head
The head has a pair of compound eyes and two sensory appendages called antennae.
Thorax
The thorax is divided into three segments. Three pairs of legs are attached to the thorax.
Abdomen
The abdomen is attached to the thorax.

6. Entomology Insects will complete one of two different life cycles.
Incomplete Metamorphosis - gradual change
Young Resemble adults but lack wings
Complete Metamorphosis - complete change
Young do not resemble adults, go through more drastic changes from young to adult

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

8. Complete Metamorphosis
Entomology
Complete Metamorphosis
Egg
Larva
Pupa
Adult

9. Entomology What is a nymph?
A juvenile insect from groups that go through incomplete metamorphesis
What is a larva?
A larva is a young insect with a soft tubular body and looks very much like a worm.
What is a pupa?
The pupa stage is a dormant stage where the larva changes into an adult.

10. There are 19 orders of insects but you must know the following 5
Entomology
There are 19 orders of insects but you must know the following 5
Orthoptera - grasshopper and locust
Hymenoptera – ants, bees and wasps
Lepidoptera – moths and butterflies
Diptera – flies
Coleoptera - beetles (the largest group of the insect orders)

11. Entomology
With your new lab partner, you will use the field guides provided in class to identify the defining characteristics of your assigned order.
You will need to share your findings with the class

12. Entomology What you need to find:
Defining physical characteristics of your order
Identify what type of metamorphosis your order goes through
The book refers to incomplete metamorphosis as “simple” metamophosis
One interesting fact about this order