pygidium|pygidia in English
noun
(Zoology) posterior segment or caudal part of the body in some invertebrates
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1. The main features of the new polychaete are: length up to 650μm; body divided into a prostomium (without any appendages), 7 segments and pygidium; segments 3 to 6 carry simple parapods as well as setae and aciculae.