... united head and thorax of arachnids and crustacea {Scanner's comment: nowadays this term is used little if at all. It does not seem ever to have been popular. Instead the terms cephalothorax or prosoma are widely used.} : that portion of an obtect pupa covering head and thorax: the anterior segments of larva that have ... — Explanation of Terms Used in Entomology • John. B. Smith
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