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Definition of Chelicerata
: a subphylum or other division of the phylum Arthropoda comprising forms having chelicerae and lacking antennae and including the horseshoe crabs and eurypterids, spiders, scorpions, and sea spiders A fossil eurypterid, representing the Chelicerata. — Stephen Jay Gould, Wonderful Life, 1989 — see arachnida merostomata pycnogonida
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