Aspects of this topic are discussed in the following places at Britannica.
Behind the gnathosoma is a large region (idiosoma) that bears the legs, the genital and anal openings, and an assortment of tactile and sensory structures. Respiratory pores (stigmata) and sclerotized shields of various shapes and sizes usually are present. The functions of the idiosoma parallel those of the abdomen, thorax, and portions of the head of insects. Although nymphs and adults...
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