entomology
Unit Two - Insect Evolution
Study Guide
Lesson Objectives
By the end of the unit you should be able to:
Describe the four successive stages of insect evolution
Define ametabolous, hemimetabolous and holometabolous, and the similar terms regarding wing development
Describe the two theories of insect wing evolution and why it is difficult to explain how insects evolved their wings.
Note: For this unit of information, listen to the lecture, then read Chapters 16 and 2. (p 18-50, p311-341) You may want to read through the questions on this study guide before beginning work on the lecture and readings. There are many new terms in the readings. We will cover the insect orders in unit 3, but there will be references to them during your readings.
Thought Questions:
1. Which types of insects are the most diverse? How many total species might there be? (p 327)
2. What are some of the advantages wings and flight provide?
Evolutionary Stages
Apterygota
1. What does "apterygote" mean?
2. Describe this stage and which insects represent this group.
Paleopterous
1. What does "paleopterous" mean?
2. Which two Insect Orders currently make up Paleoptera?
3. Describe this stage and which insects represent this group.
4. Explain the difference between the direct flight musculature found in dragonflies and the indirect musculature found in mayflies and other winged insects.
Wing Flexon (Infraclass Neoptera)
1. What does "neopterous" mean?
2. Describe this stage and which insects represent this group.
3. How was this stage an advantage over the previous stages?
4. Why do some researchers prefer to use the terms exopterygota and endopterygota to hemimetabola and holometabola?
Metamorphosis terms
Differentiate between ametabolous, hemimetabolous, and holometabolous.
Type of metamorphosis
Definition
Insects that do this ametabolous hemimetabolous
holometabolous
Other topics to
Study Guide
Lesson Objectives
By the end of the unit you should be able to:
Describe the four successive stages of insect evolution
Define ametabolous, hemimetabolous and holometabolous, and the similar terms regarding wing development
Describe the two theories of insect wing evolution and why it is difficult to explain how insects evolved their wings.
Note: For this unit of information, listen to the lecture, then read Chapters 16 and 2. (p 18-50, p311-341) You may want to read through the questions on this study guide before beginning work on the lecture and readings. There are many new terms in the readings. We will cover the insect orders in unit 3, but there will be references to them during your readings.
Thought Questions:
1. Which types of insects are the most diverse? How many total species might there be? (p 327)
2. What are some of the advantages wings and flight provide?
Evolutionary Stages
Apterygota
1. What does "apterygote" mean?
2. Describe this stage and which insects represent this group.
Paleopterous
1. What does "paleopterous" mean?
2. Which two Insect Orders currently make up Paleoptera?
3. Describe this stage and which insects represent this group.
4. Explain the difference between the direct flight musculature found in dragonflies and the indirect musculature found in mayflies and other winged insects.
Wing Flexon (Infraclass Neoptera)
1. What does "neopterous" mean?
2. Describe this stage and which insects represent this group.
3. How was this stage an advantage over the previous stages?
4. Why do some researchers prefer to use the terms exopterygota and endopterygota to hemimetabola and holometabola?
Metamorphosis terms
Differentiate between ametabolous, hemimetabolous, and holometabolous.
Type of metamorphosis
Definition
Insects that do this ametabolous hemimetabolous
holometabolous
Other topics to