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Arachnida
• Antennae absent
• Spiders, ticks, mites, scorpions, etc.
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Crustacea
• Two pair of antennae present
• Crawfish, crabs, sowbugs, 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