(39)Before you arrive for the Survey of the Animal Kingdom: Phylum Arthropoda lab, please
1. Read the lab thoroughly, noting all safety guidelines.
2. Answer these preparatory questions:
What safety procedures should you be sure to follow during this lab period?
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What characteristics have contributed to the diversity and abundance of arthropods?
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Is the circulatory system of arthropods more similar to that of annelids or of molluscs? Why?
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How is growthin arthropods different from growth in humans? What must arthropods do before they can increase in size?______
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What is the difference between simple and compound eyes?______
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What is the function of the telson?______
Are spiders insects? Why or why not?______
Most so-called “spider bites” are actually insect bites. Study Figure 39.3b. How many holes would be present in the wound from a spider bite? ______
To which body segment are “spider legs” attached?______
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Describe any poisonous spiders in your geographic region. If there aren't any, describe 2 poisonous species from neighboring regions.
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If no poisonous spiders occur naturally in a geographic region, does that mean they could not be present? How might they arrive?
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How do spiders benefit humans?______
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What are characteristic features of crustaceans?______
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How does the body structure of a crayfish explain why its telson is shorter than that of a horseshoe crab?
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How is the location of a crayfish heart different from that of a human heart?
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Keeping in mind that body fluid of a crayfish is saltier than the fresh water it occupies, and remembering the mechanism of osmosis, what do you suppose the function of the antennal gland is?
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How can you distinguish a millipede from a centipede?______
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Could a centipede, a millipede, or both wound prey?______
What are the major factors that contribute to the success of insects?______
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Your instructor has just presented your lab group with a tray of Arthropods that she would like you to identify. As you examine the creatures, you note various diagnostic features. These features and a selection of common names of some Arthropods are listed below. Match the Arthropods with their characteristics as if you were making these observations in lab.
SpiderA. 6 legs, 3 body parts, piercing mouthparts
MosquitoB. 6 legs, 3 body parts, sponging mouthparts
GrasshopperC. 6 legs, 3 body parts, chewing mouthparts
MillipedeD. 2 pairs of antennae
Crayfish E. 1 pair of legs per body segment
Fly F. 2 pairs of legs per body segment
CentipedeG. 8 legs, 2 body segments