The pygidium (plural pygidia) is the posterior body part or shield of crustaceans and some other arthropods, such as insects and the extinct trilobites. 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. ==Chelicerates== In ara...
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http://en.wikipedia.org/wiki/Pygidium
• (n.) The caudal plate of trilobites, crustacean, and certain insects. See Illust. of Limulus and Trilobite.
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http://thinkexist.com/dictionary/meaning/pygidium/
Sensory organ of a posterior tergite of fleas, which apparently detects air currents.
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Py·gid'i·um noun ;
plural Pygidia . [ New Latin , from Greek ..., dim. of ... the rump.]
(Zoology) The caudal plate of trilobites, crustacean, and certain insects. See
Illust. of
Limulus and
Trilobite .
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http://www.encyclo.co.uk/webster/P/202
A caudal structure or the terminal body region of various invertebrates.
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http://www.geog.ubc.ca/biodiversity/efauna/InsectGlossary.html
In trilobites, the posterior division of the body, formed by fusion of the telson with one or more posterior pleurae.
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http://www.ucmp.berkeley.edu/glossary/gloss7metazoa.html
In trilobites, the posterior division of the body, formed by fusion of the telson with one or more posterior pleurae.
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http://www.ucmp.berkeley.edu/glossary/glossary_7.html
pygidium (s), pygidia (pl); pygidial The posterior part of the body in certain invertebrates, chiefly insects, crustaceans, and worms, when forming a distinct segment or division; the caudal or pygal segment.
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http://www.wordinfo.info/words/index/info/view_unit/1046/2
Collection of a few fused bones making up of the tail of a bird.
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https://www.birds-of-north-america.net/Bird_Terminology.html
the posterior part of the body in certain invertebrates
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any of various structures or regions at the caudal end of the body in certain invertebrates.
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https://www.infoplease.com/dictionary/pygidium
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