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    Arachnids are the largest group of chelicerates, and are the spiders and their relatives. There are three major groups of chelicerates:

    • horseshoe crabs 
    • sea spiders
    • arachnids

    Chelicerate features:

    • no antennae
    • four pairs of legs
    • one pair of chelicerae

    Arachnids also include mites, ticks, chiggers and scorpions. 


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