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MICHAEL ALLABY. "pygidium." A Dictionary of Zoology. 1999. Encyclopedia.com. 10 Feb. 2010 <http://www.encyclopedia.com>.
MICHAEL ALLABY. "pygidium." A Dictionary of Zoology. 1999. Encyclopedia.com. (February 10, 2010). http://www.encyclopedia.com/doc/1O8-pygidium.html
MICHAEL ALLABY. "pygidium." A Dictionary of Zoology. 1999. Retrieved February 10, 2010 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-pygidium.html
(Including press releases, facts, information, and biographies)
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A teratological pygidium of the upper cambrian trilobite Eugonocare...
Magazine article from: Journal of Paleontology Lee, Jeong Gu; Choi, Duck K; Pratt, Brian R January 1, 2001 700+ words ...1843) first report on a teratological pygidium of Phillipsia ornata (cf. Babcock...number of segments on the thorax and pygidium. For example, Owen (1980) described...This paper describes a malformed pygidium of Eugonocare (Pseudeugonocare) bispinatum... |
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PARANACASTE PONTAGROSSENSIS POPP, 1989 (TRILOBITA: ACASTOIDEA): PROPOSED...
Magazine article from: Journal of Paleontology de Carvalho, Maria da Gloria Pires; Edgecombe, Gregory D May 1, 2006 700+ words ...thorax lacking axial spines, and the pygidium being small and semicircular, with an entire margin. The assignment of a rounded pygidium to P. pontagrossensis, questioned by...bearing transversely widened median spine; pygidium with posteroinedian spine in most species... |
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Larval morphology and ontogeny of a late Devonian phacopid with reduced sight...
Magazine article from: Journal of Paleontology Cronier, C; Bartzsch, K; Weyer, D; Feist, R March 1, 1999 700+ words ...the genal angles); PL as length of pygidium including articulating half ring; PW as maximum width of pygidium (L = length, WM = maximum width, Wm...cephalon, G = glabella, R = rachis, P = pygidium); Sag. = sagittal; Tr. = transversal... |
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Bartonaspis new genus, a trilobite species complex from the base of the Upper...
Magazine article from: Canadian Journal of Earth Sciences Westrop, Stephen R. Adrain, Jonathan M. July 1, 2007 700+ words ...the glabella, and by a subelliptical pygidium with a short convex axis composed of...morphology. In contrast to Bartonaspis, the pygidium of Dellea has an axis composed of four...coins anterieurs de la glabelle et un pygidium subelliptique presentant un court axe... |
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Phalloidin labeling of developing muscle in embryos of the polychaete capitella...
Magazine article from: The Biological Bulletin Hill, Susan D. Boyer, Barbara C. October 1, 2001 700+ words ...immediately anterior to t he terminal pygidium. The development of muscle patterns...will reach from the prostomium to the pygidium begin to develop; (2) two lateroventral...ventrally from the stomodeum into the pygidium (Fig. 1b); (4) medially, a second... |
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THE UPPER CAMBRIAN TRILOBITE STENOPILUS: MORPHOLOGY, MODE OF LIFE
Magazine article from: Journal of Paleontology Whittington, Harry B March 1, 2005 700+ words ...species S. intermedius in its greater length and convexity; the pygidium is known from rare complete specimens. These two species are...Figures 1-3, this term is used for a similar view of the pygidium. In a dorsal view of a cranidium or cephalon the median posterior... |
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Hanburia gloriosa: Rare trilobite from the Middle Cambrian, Stephen Formation,...
Magazine article from: Journal of Paleontology Whittington, Harry B July 1, 1998 700+ words ...lateral lobes, and six, in one case seven, thoracic segments; pygidium equal in size to the cephalon. All specimens may be holaspid...Conocoryphe; thorax of 6 or 7 segments, pleural spines absent; pygidium of similar width (tr.) and length to cephalon, pleural... |
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The Miocene whipscorpion Thelyphonus hadleyi is an unidentifiable organic...
Magazine article from: Journal of Arachnology Dunlop, Jason A. Tetlie, O. Erik September 1, 2007 700+ words ...opisthosoma" ca. 8 mm long with maximum width of 4.5 mm; "pygidium" ca. 4 mm long, 1.5 mm wide; "prosoma" ca. 6 mm long...it vaguely resembles the abdomen of a whip scorpion with a "pygidium" turned almost at right angles, but no telson (Fig. 1... |
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First North American records of the east Palearctic seed beetle Bruchidius...
Magazine article from: Florida Entomologist Hoebeke, E. Richard Wheeler, A.G., Jr. Kingsolver, John M. Stephan, David L. September 1, 2009 700+ words ...usually black, sometimes testaceous; pronotum, elytra, and pygidium black, sometimes testaceous (among specimens examined...1); apices of elytra sometimes dark brown (Fig. 3); pygidium (Fig. 3) usually immaculately silvery gray, sometimes with... |
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Illaenidae (Trilobita): Morphology of thorax, classification, and mode of life
Magazine article from: Journal of Paleontology Whittington, Harry B September 1, 1997 700+ words ...anastomosing caeca on the fixed cheek and the pleural region of the pygidium are described. INTRODUCTION RADICAL change in the classification...long axis of the eye surface horizontal, and the thorax and pygidium curved down, buried in a burrow in the sediment. A specimen... |
For more facts and information, see all related premium articles
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pygidium
Book article from: A Dictionary of Earth Sciences pygidium (adj. pygidial ) The posterior part of the exoskeleton...trilobites are either isopygous, where the cephalon and pygidium are the same size, or heteropygous, where the pygidium is the smaller. In some cases the pygidium is larger... |
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Annelida
Book article from: The Columbia Encyclopedia, Sixth Edition ...of metameres; and an unsegmented terminal region called the pygidium. In some primitive members of the phylum the metameres are...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... |
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trilobites and related fossils
Book article from: The Oxford Companion to the Earth ...completely. The most posterior section of the animal is termed the pygidium, a flat plate of fused segments similar to the thorax. Ventrally...cephalon and one pair for each segment through the thorax and the pygidium. The appendages are divided into a gill branch and a walking... |
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Arthropoda
Book article from: The Columbia Encyclopedia, Sixth Edition ...The flattened, oval body was composed of a head covered by a dorsal shield, a trunk (thorax), and a terminal segment (pygidium). Most of the 3,900 species ranged in length from 1 to 4 in. (2.5-10 cm); some planktonic forms were smaller... |
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Fideliidae
Book article from: A Dictionary of Zoology ...hind legs, and in possessing certain primitive characters; three submarginal cells in the fore wing, and pygidial (see PYGIDIUM ) and basitibial plates in the female. The brood cells are unlined. The family has a disjunct distribution, with one genus... |
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