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| | Pygidium - definition of Pygidium in Encyclopedia |
 | | It is composed of fused body segments, sometimes with a tail, and separated from thoracic segments by an articulation. | | | The pygidium is the posterior body part or shield of crustaceans, some insects, and trilobites. | | | In trilobites, the pygidium can range from extremely small (much smaller than the head, or cephalon) to larger than the cephalon. |
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http://encyclopedia.laborlawtalk.com/Pygidium
(140 words)
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| | Annelida. The Columbia Encyclopedia, Sixth Edition. 2001-05 |
| | The external divisions, which may be seen in the common earthworm, correspond to the internal divisions. | | | The digestive system of annelids consists of an unsegmented gut that runs through the middle of the body from the mouth, located on the underside of the head, to the anus, which is on the pygidium. | | | The gut is separated from the body wall by the body cavity, called the coelom. |
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http://www.bartleby.com/65/an/Annelida.html
(3087 words)
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| | Palaeos Books: Reviews |
| | “So in just eight technical terms – cephalon, thorax, pygidium, segment, axis, pleura, glabella, eyes – it is possible to begin to embrace the form of these strange animals. |
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http://www.palaeos.com/Books/Reviews.html
(4976 words)
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