BOOK-SCORPION, or FALSE SCORPION, minute arachnids superficially resembling tailless scorpions and belonging to the order Pseudoscorpiones of the class Arachnida. [Please select]
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Acerata: arthropods without true antennae Arachnids and Limulus Acetabular caps: Hemiptera; the coxal cavity. [Please select]
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This singular form is one of the lowest and most degraded of the order of Arachnids. [Please select]
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Cephalotheca: the united head and thorax of arachnids and crustacea {Scanner's comment: nowadays this term is used little if at all. [Please select]
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