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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.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
Cheliped
Liver
Intestine
Gonad
Uropod
Gill
Heart
Telson
Abdomen
Antennae
Cephalothorax
Swimmeretes
Antennule
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 gland
2. Spinnerets
3. Fangs
4. Poison glands
5. Book lungs
6. 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.
2.
3.
4.
Membranous wings
Scaled wings
Leather-like wings
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.
2.
3.
4.
5.
Finish OYO questions for Module 12
Finish Study Guide Questions for Mod 12
Take Module 12 Test
Read Module 13 (pages 393 - 421)
Quiz: Arthropods ID 20 pictures