Home >> Flashcards >> Biology >> ch. 28 Arthropods
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Definition
| a sructure that extends from the body like a leg or an arm or a wing. |
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| a hard outer covering of protein and chitin. It must molt or shed for a new one as the critter grows. |
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| head, thorax, and abdomen |
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| spiders, ticks, scorpions, milli& centipedes, insects, horseshoe crabs, crabs, lobsters, shrimp, crawfish, barnicles, pill bugs |
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| Mereistomata - a living fossil which hasn't changed for 500 million years |
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| crabs, lobsters, shrimp, crawfish, pill bugs |
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| spiders - 4 pairs of legs and 2 body segments, produce silk but not all do webs. Two are poisonous black widow and brown recluse. |
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| arachnids that are parasites and spread Lymes disease. |
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