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15 Cards in this Set
- Front
- Back
What characteristics do biologists use to classify arthropods?
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the number and structure of their body segments and appendages, particularly their mouthparts
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what are the 3 main groups of arthropods?
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crustaceans
spiders insects |
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What is true about crustaceans?
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two pairs of branched antennae
chewing mouthparts called mandibles two or three body sections |
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the largest group of crustaceans are the....
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decapods?
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horseshoe crabs, spiders, ticks, and scorpions are grouped as...
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chelicerata
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What is true about chelicerates?
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four or five pairs of legs
mouthparts called chelicerae |
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What is the function of chelicerae?
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contains fangs and are used to stab and paralyze prey
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the appendages near the mouth that are usually modified to grab prey are called...
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pedipalps
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What arthropods do arachnids include?
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spiders, mites, ticks, and scorpions
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What is true about spiders and silk?
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spiders spin silk into cocoons for eggs
spinning webs seems to be a programmed behavior spinnerets are organs that contain silk glands |
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Scorpions have pedipalps that are enlarged into...
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claws
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What do ticks transmit that cause Rocky Mountain spotted fever and Lyme disease?
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bacteria
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Centipedes, millipedes, and insects are all grouped as...
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Uniramia
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How many pairs of legs does each body segment of most centipedes have?
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a few to 100 pairs
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How many pairs per segment do millipedes have?
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two
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