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Classes of Arthropods
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Dichotomous Key
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Anatomy Compound Eye Head Thorax Ocelli Abdomen Abdomen Cephalothorax
Antennae Abdomen Cephalothorax
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Arachnida Antennae absent Spiders, ticks, mites, scorpions, etc.
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Black Widow Spider
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Brown Recluse Spider
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Crustacea Two pair of antennae present Crawfish, crabs, sowbugs, etc.
audilab.bmed.mcgill.ca images.allmoviephoto.com
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Insecta One pair of antennae Three pairs of legs
Beetles, butterflies, bees, etc.
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Chilopoda Many pairs of legs with one pair of legs per body segment
Poisonous fangs at end of body Centipedes
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Diplopoda Many pairs of legs with two pairs of legs per body segment
Millipedes
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