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Topic: Pygidium

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	Pygidium - Biocrawler (Site not responding. Last check: 2007-10-28)
		The pygidium is the posterior body part or shield of crustaceans and some arthropods, such as insects and the extinct trilobites.
		It is composed of fused body segments, sometimes with a tail, and separated from thoracic segments by an articulation.
		Pygidium is also a superseded genus of fish of the family Trichomycteridae.
	www.biocrawler.com /encyclopedia/Pygidium (150 words)

	Trilobites - LoveToKnow 1911
		The mid-region of the body, composed of jointed segments, is followed by a larger or smaller region consisting of fused segments and termed the pygidium or caudal shield, which in some cases is as large as the head-shield itself, in other cases much smaller.
		When the pygidium is large and composed of many segments, the number of free body segments is correspondingly reduced, and vice versa.
		Under the pygidium or caudal shield the appendages were much shortened, and their main branch consisted of broader and flatter segments than those of the preceding limbs.
	www.1911encyclopedia.org /Trilobites (981 words)

	pygidium - Encyclopedia.com
		pygidium The terminal segment of an insect; the sclerites which surround the anus.
		Pygidium in males with one pair of cirri of similar size and...
		Label in the pygidium is becoming dense and organized except in the dorsal region...
	www.encyclopedia.com /doc/1O8-pygidium.html (702 words)

	Trilobite Tagmosis and Body Patterning from Morphological and Developmental Perspectives -- Hughes 43 (1): 185 -- ...
		The trunk region is divided into the freely articulating segments of the thorax and the fused segments of the pygidium.
		and in the meraspid phase is known as the transitory pygidium.
		manner, from the anterior of the transitory pygidium.
	icb.oxfordjournals.org /cgi/content/full/43/1/185 (7209 words)

	Pygidium -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-28)
		It is composed of fused body segments, sometimes with a tail, and separated from (additional info and facts about thoracic) thoracic segments by an articulation.
		In trilobites, the pygidium can range from extremely small (much smaller than the head, or (additional info and facts about cephalon) cephalon) to larger than the cephalon.
		Pygidium is also a superseded ((biology) taxonomic group containing one or more species) genus of (Any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills) fish of the ((biology) a taxonomic group containing one or more genera) family Trichomycteridae.
	www.absoluteastronomy.com /encyclopedia/p/py/pygidium.htm (184 words)

	InfoHub - View Single Post - Olenoides nevadensis - A Trilobite Species
		This species had needle-like axial and pygidial spines (ones protruding from the pygidium, i.e.
		The pleura is the lateral part of the thoraxic segment or lateral (non-axial) part of pygidium.
		Subisopygous means that the pygidium is large, but is smaller than the cephalon (head).
	www.infohub.com /forums/showpost.php?p=7708&postcount=1 (322 words)

	Aquaculture of marine invertebrates \| Institute of Marine Sciences \| University of Portsmouth
		Pygidium beginning to form at the most posterior end and gill filaments of the branchial crown are visible, C) Week 2.
		Pygidium (the most posterior end of the worm) is now distinguishable and one level of eye spots (photoreceptive cells) are present on the branchial crown from the anterior surface, D) Week 4.
		Fully formed individual specimen with 5 eye spots present on the branchial crown to the anterior and a complete pygidium most posterior.
	www.port.ac.uk /departments/academic/ims/research/aquacultureofmarineinvertebrates (496 words)

	Cephalon & Pygidium Relationships
		While the cephalon of a trilobite is typically wider than the thorax, and one of the single largest major features of a trilobite body, the pygidium (tail piece) can range from extremely small to larger than the cephalon.
		The relationship between segments and articulations is discussed further in the ontogeny and development page, where the role of the pygidium in growth and addition of segments is seen.
		In addition to size, the pygidium can be small and simple; or larger, but otherwise similar to the thoracic segments before it (the homonomous condition), or distinguished by modifications such as spines and lobes, or otherwise quite different in morphology from the thoracic segment pattern (the heteronomous condition).
	www.trilobites.info /pygyterms.htm (269 words)

	Annelida. The Columbia Encyclopedia, Sixth Edition. 2001-05
		Setae are used to grip the soil, to hold the animal in a tube, or to increase the surface areas of appendages for swimming.
		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.
	www.bartleby.com /65/an/Annelida.html (3087 words)

	pygidium - Search Results - ninemsn Encarta
		Ankylosed: no facial suture evident in ankylosed forms: Axial ring: central portion of thoracic segment or a segment of the pygidium: Axis: central lobe running the length of the trilobite body
		The pygidium is a minute, segmented disc at the end of the animal.
		While the cephalon of a trilobite is typically wider than the thorax, and one of the single largest major features of a trilobite body, the pygidium (tail piece) can range from extremely small to...
	au.encarta.msn.com /pygidium.html (147 words)

	Franklin & Marshall - Subphylum Arachnomorpha
		Pygidium BCTHZX(Q) - Eighth segment appears to be attached to the pygidium (Walcott, 1912, p.
		Pygidium BCTHZX(Q) - "un pigidio formato dalla coalescenza dei tre ultimi metameri col telson." No reference to mode of articulation with trunk segments.
		- Blunt dorsal and marginal spines on the "pygidium".
	www.fandm.edu /x8274.xml (6072 words)

	Introduction to the Agnostida
		Agnostid trilobites were rather unusual trilobites: it is thought by some paleontologists that they may have been planktonic.
		They are small, often lack eyes, and have a pygidium the same size as the cephalon; it can be difficult to tell which end of an agnostid is the front!
		Agnostids appeared in the Lower Cambrian and are common in some Cambrian rocks; they became rare in the Ordovician and went extinct at the end of the Ordovician.
	www.ucmp.berkeley.edu /arthropoda/trilobita/agnostida.html (193 words)

	Pygidium
		The word "pygidium" uses 8 letters: D G I I M P U Y.
		Words within pygidium not shown as it has more than seven letters.
		List all words starting with pygidium, words containing pygidium or words ending with pygidium
	www.morewords.com /word/pygidium (142 words)

	Dryophthoridae of Costa Rica and Panama
		Front coxae contiguous; anterior margin of pronotum with postocular lobe; pygidium largely covered by elytra; tarsus with article 3 subequal in width to article 2; mandibles triangular, directed anteriorly and with inner edge lacking teeth
		Front tibia with outer apical angle produced anterolaterally to a sharp or narrowly rounded angle; middle and hind legs robust, tibiae much wider at apex than at base, fossorial in form
		Mandibles large, divaricate, divergent, with distinct teeth on outer edge; outer face concave medially; pygidium largely covered by elytra
	www.inbio.ac.cr /papers/Dryophthoridae/key.htm (977 words)

	Definition of pygidium - Merriam-Webster Online Dictionary
		Learn more about "pygidium" and related topics at Britannica.com
		Find more about "pygidium" instantly with Live Search
		See a map of "pygidium" in the Visual Thesaurus
	www.merriamwebster.com /dictionary/pygidium (48 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal
		In arachnids, the pygidium is formed by reduction of the last three opisthosomal segments to rings where there is no distinction between tergites and sternites.
		A pygidium is present in Palpigradi, Amblypygi, Thelyphonida, Schizomida, Ricinulei and in the extinct order Trigonotarbida.
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	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=pygidium (175 words)

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