Arthropods constitute the largest phylum by far, with major subgroups of insects, chelicerates (spiders, mites, scorpions, and horseshoe crabs), and crustaceans …—Stephen Jay Gould, Natural History, January 1995
chelicerateadjective
the chelicerate nervous system
chelicerate arthropods
Together, these marine and terrestrial orders are called the chelicerate orders based on the structure of their mouthparts, in contrast to the orders to which insects and crustaceans belong. —Rosemary G. Gillepsie and Joseph C. Spagna, in Encylopedia of Insects, 2003
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