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subphylums:
- Crustacea
- Chelicerata
- Triolobata
- Myriapoda
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Crustacea classes
- Maxilopoda-plankton, sea lice
- Malacostraca-shrimp, crab, crayfish
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Myriapoda classes:
- Dilopoda-millipedes
- chilopoda-centipedes
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Chelicerata classes:
Archanida-spiders, scorpions, mites, ticks
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characteristics:
- segmented
- coelmates
- appendages
- exoskeleton (3 layers)
- compound eyes
- open circulatory
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Arthopoda means......
"jointed foot"
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Arthopods make up ........of all animal species
2/3
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