Honors Biology

Module 12 Arthropods – Part 2

February 25, 2014

Class Challenge

Name Quiz # 21 February 27, 2014

Identify the parts of a crayfish:

Number your paper 1 - 14

Draw and label the lifecycle of a crustacean.

Extra Credit

Name the common crabs found in Florida:

At least 4

1. Cheliped2. Liver3. Intestine4. Gonad5. Uropod6. Gill7. Heart8. Telson9. Abdomen10. Antennae11. Cephalothorax12. Swimmeretes13. Antennule14. Walking legs

Life cycle of a crustacean

Extra Credit

Name the common crabs found in Florida:

1. Spider

2. Box

3. Mud

4. Stone

5. Fiddler

6. Blue (possible 23 points)

Class Arachnida

All about Spiders

Arachnida have 5 common characteristics:

1. Fours pairs of walking legs

2. A cephalothoras instead of separate head and thorax

3. Usually have four pairs of simple eyes

4. No antennae

5. Respiration done through organs known as “book lungs.”

What separates Arachnids from insects ….

Arachnids have 8

legs (4 pairs)

Insects have six

legs (three pairs)

The second characteristic listed tells you that arachnids have only two body segments. – cephalothorax and an abdomen.

You can count the “bumps” on the spider to that there are four pairs of simple eyes.

Spiders do not have antennae.

What are Book Lungs?

Spiders breath through book lungs. They do the same job that gills do in a crayfish or a crab. They don’t extract dissolved oxygen gas from water, they extract oxygen from air. (Fig. 12.7)

Air enters the exoskeleton through a slit in the abdomen, which is called spiracle. There it enters an organ that has several thin layers, almost like pages in a book. There the oxygen is absorbed by the blood and carbon dixoide is released.

Some Spiders Spin Webs, others Do Not…. Figure 12.6

Tarantula stalk their prey, sneaking up and pouncing on unaware creatures.

Web spinning Spiders weave their webs out of spider silk. This incredible substance is very flexible and strong. We all of walked through a spider web.

Comparing the spider silk’s strength, it would be stronger than a steel pipe of the same size, yet it would be almost as flexible as a rope. A spider silk rope that is just a bit thicker than a garden hose, for example, can support the weight of two full Boeing 737 airplanes.

Page 378, Paragraph 1

I need a volunteer to read this….

Three types of Spider Webs

Sheet Web

Tangle Web

Orb Web

Many of the Spider’s organs are similar to the crayfish

However, the most different organs are the:1. Silk gland2. Spinnerets3. Fangs4. Poison glands5. Book lungs6. Spiracle FIGURE 12.7

Class Chilopoda and Diplopoda

Chilopoda -- think Centipedes

Figure 12.8

Diplopoda- think Millipede

What is the Difference

Class Insecta

1. Three pairs of walking (or jumping) legs

2. Usually have wings at some stage of their life

3. One pair of antennae

4. Three segments: head, thorax, and abdomen

Insect Wings

Most have two pairs of wings, some have one pair, and a very few have none at all.

1. Membranous wings

2. Scaled wings

3. Leather-like wings

4. Horny wings

Anatomy of an Insect

See Figure 12.9

Insects have no respiratory system however they have interconnecting tubes called tracheas. These tubes connect to a series of small holes in the exoskeleton called spiracles. The Oxygen goes directly into the tissues, where oxygen and carbon dioxide are directly exchanged within the cells.

Reproduction and Development in Insects

• What is the difference between Complete and Incomplete Metamorphosis?

Phylum Arthropods - Class Insect -- Order Lepidoptera (Ants, bees, Wasps) Order Coleoptera (Beetles) Order Diptera (Flies, Gnats, Mosquitoes) Order Orthoptera (Grasshoppers and Crickets)

Experiment 12.2

Insect Classification

OBJECT: To become familiar with classifying insects.

Homework

1. Finish OYO questions for Module 12

2. Finish Study Guide Questions for Mod 12

3. Take Module 12 Test

4. Read Module 13 (pages 393 - 421)

5. Quiz: Arthropods ID 20 pictures