cercus

From ZooTerms (Dictionary of Invertebrate Zoology)
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cercus (noun; plural cerci; Greek kerkos, tail): (Arthropoda) One of a pair of appendages that arise at the posterior of the abdomen of arthropods that function as sense organs; abdominal filaments; acrocercus; anal forceps; anal styles; anal stylets; caudal filaments; caudal setae; caudal ramus; spinnerets of Symphyla; tergal valves; for Coleoptera see urogomphi.