Term
| Main features of Arthropods: |
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Definition
1. segmented bodies
2. a tough exoskeleton
3. jointed appendages |
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Term
| Important trends in arthropod evolution: |
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Definition
| natural selection, and other processes, has led to fewer body segments and highly specialized appendages for feeding, movement, and other functions. |
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Term
| When an arthropod outgrows its exoskeleton: |
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Definition
| The exoskeleton is like a suit of armor that protects and supports the body. When the arthropod outgrows the exoskeleton, they undergo periods of molting - it sheds its entire exoskeleton and manufactures a larger one to take its place(controlled by endochrine system). |
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Term
| Describe arthropod respiration: |
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Definition
-most breathe thru a network of trachial tubes
-air enters the trachial tubes thru spiracles(small openings located along the side of the body)
-others, such as spiders, use book lungs(organs that have layers of respitory tissue like pages
of a book)
-Lastly, aquatic arthropods, repire thru featherlike gills
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Term
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Definition
cephalothorax - anterior end, formed by fusion of the head with the thorax(houses most of the internal organs); the carapace covers the cephalothorax
abdomen- posterior end
mandible - mouthpart adapted for biting and grinding food
chelipeds - first pair of legs to catch and pick up food
swimmerets - flipperlike appendages used for swimming
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Term
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Definition
Insects have bodies divided into three parts:
1. head
2. thorax
3. abdomen
Three pairs of legs are attached to the thorax. |
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Term
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Definition
- belong to class Chilpoda
- a few to 100 pairs of legs
- most body segments have one pair of legs
- are carnivores, whose mouths have venemous claws
- live beneath rocks or in the soil
- bodies loose water easily as exoskeleton not waterproof
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Term
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Definition
- from class of Diplopoda
- have highly segemented bodies
- each body segment bears TWO, not one, pair of legs
- live under rocks and in decaying logs
- feed on dead and decaying plant life
- roll up in a ball to protect self, or when scared; protects soft undersides
- protects self by secreting unpleasant or toxic chemicals |
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