Pygidium
Posterior body part or shield of crustaceans and some other arthropods / From Wikipedia, the free encyclopedia
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The pygidium (pl.: pygidia) is the posterior body part or shield of crustaceans and some other arthropods, such as insects and the extinct trilobites. In groups other than insects, it contains the anus and, in females, the ovipositor. It is composed of fused body segments, sometimes with a tail, and separated from thoracic segments by an articulation.[1]