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Topic: Agnostida

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	Agnostida - EvoWiki
		The Agnostids strongly resembled a pair of castanets, in that, the cephalon and the pygidium were grossly enlarged, and resembled each other, and were connected to each other by a thorax that only consisted of 2 to 3 segments.
		Agnostida is divided into two suborders, Agnostina, and Eodiscina.
		The Eodiscina links Agnostida to the rest of the trilobites, and tend to resemble other trilobites better than the Agnostina agnostids.
	wiki.cotch.net /index.php/Agnostida (0 words)

	Bambooweb: Agnostida
		Agnostida first appeared toward the end of the Lower Cambrian, and thrived in the Middle Cambrian.
		The Agnostida are divided into two suborders—Agnostina and Eodiscina—that are then divided into a number of families.
		The Agnostida have, as a result of their name, occasionally been the source of geek humor—for example, the order may be defined as those Trilobita who aren't sure God exists.
	www.bambooweb.com /articles/a/g/Agnostida.html (0 words)

	Palaeos Invertebrates : Order Agnostida
		It has been suggested that some Agnostida were planktonic.
		Introduction: There is some controversy over the placement of Eodiscina in the Agnostida.
		Presence of eyes, sutures, and typical thoracic structure suggest that Eodiscina may be more akin to (or a suborder of) Ptychopariida, but for now the overall similarity to Agnostina and (placement in Agnostida) prevails in the 1997 systematic treatment of the current Treatise.
	www.palaeos.com /Invertebrates/Arthropods/Trilobita/Agnostida.html (430 words)

	Agnostida
		Agnostida first appeared toward the end of the Lower Cambrian, and thrived in the Middle Cambrian.
		The last agnostids held out until the late Ordovician.
		The Agnostida are divided into two suborders that are then divided into a number of families.
	www.ebroadcast.com.au /lookup/encyclopedia/ag/Agnostida.html (218 words)

	News \| Gainesville.com \| The Gainesville Sun \| Gainesville, Fla. (Site not responding. Last check: )
		As a group, agnostids have pygidia (tails) that are so similar in size and shape to their cephalons (heads) that it is difficult to distinguish which end is which.
		The challenge to the status has focused on the Agnostina partly because juveniles of one genus have been found with legs greatly different from those of adult trilobites, suggesting they are separately descended from Crustaceans.
		Other researchers have suggested, based on cladistic analyses, that Eodiscina and Agnostida are closely united, and that the Eodiscina descended from the trilobite Order Ptychopariida.
	www.gainesville.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=agnostida (407 words)

	Frame AGNOSTIDA_(e)
		The representatives of the Agnostida are usually only a few mm in size.
		A typical characteristic of this order is the nearly identical construction in size and outline of cephalon and pygidium (isopygous), as well as the low number of thoracic segments.
		The AGNOSTIDA are including the suborders Agnostina and Eodiscina.
	www.wir-trilobiten.de /Frames/Trilobita/Frame%20Agnostida_(e).htm (231 words)

	AGNOSTIDA FACT SHEET
		In the image above, Agnostida (yellow) is seen as an early order, arising in the middle Cambrian and persisting to the late Ordovician.
		The arrangement of genera and families for suborder Agnostina is via Jell and Adrain 2003, superceding some of the classification of Agnostida in the 1997 Treatise.
		Presence of eyes, sutures, and typical thoracic structure suggest that Eodiscina (especially Pagetiidae) are akin to Ptychopariida, but overall similarity to Agnostina (and placement in Agnostida) prevails in the 1997 systematic treatment of the current Treatise.
	www.trilobites.info /ordagnostida.htm (0 words)

	Evolutions majeures (Site not responding. Last check: )
		The whole order Agnostida is composed of small trilobites with 2 or 3 thoracic segments.
		Some thinks that its linked with a parasitic life, others thinks Agnostida’s are parts of plankton, other thinks that Agnostida could have lived attached to stones or algae to filter water.
		However, it is difficult to choose between all theories about Agnostida mean of life, because one very important characteristic to determine it is the shape of appendages that are rarely preserved.
	denis.audo.free.fr /VE/evolution.html (1131 words)

	Frame AGNOSTIDA
		Bei den Vertretern der AGNOSTIDA handelt es sich um nur wenige mm große Trilobiten.
		Die AGNOSTIDA umfassen die Unterordnungen Agnostina und Eodiscina.
		Die Agnostida waren, mit Ausnahme weniger Vertreter der Eodiscina, augenlos.
	www.wir-trilobiten.de /Frames/Trilobita/Frame%20Agnostida.htm (185 words)

	Harpetida - Medicow (Site not responding. Last check: )
		Today there are nine generally recognised orders of trilobites: the Agnostida, Redlichiida, Corynexochida, Lichida, Phacopida, Ptychopariida, Harpetida, Asaphida and Proetida.
		The first volume of the revised Treatise covering two Orders, Agnostida and Redlichiida, was published in 1997.
		Der Autor stellt Teile seiner Fossil-Sammlung vor., Trilobiten, Trilobit, Trilobita, Trilobite, Trilobites, Arthropoda, Arthropoden, Gliederfuesser, Fossilien, Erdaltertum, Agnostida, Asaphida, Corynexochida, Harpetida, Lichida, Phacopida, Proetida, Ptychopariida, Redlichiida, Cephalon, Thorax, Pygidium, Loben, Pleuren, Cranidium, Glabella, schizochroal, holochroal, Kambrium, Ordovizium, Devon, Silur, Karbon, Perm, Praekambrium, Jura, Kreide, Palaeozoikum...
	www.medicow.com /topics/Harpetida (1180 words)

	Signification des différentes subdivisions (Site not responding. Last check: )
		- Agnostida are very small with only 2 or 3 thoracic segments.
		Agnostida order is made of two suborder :
		Order Agnostida seems to come from Redlichiida's order by neoteny (retention of juvenile characteristic in adulthood – that explain miniaturisation).
	denis.audo.free.fr /VE/Class_raison.html (644 words)

	Agnostida bei Ratgeber Lexikon - Beschreibung und Bedeutung
		Agnostida bei Ratgeber Lexikon - Beschreibung und Bedeutung
		Die Agnostida, Salter 1864 stellen eine von gegenwärtig neun anerkannten Ordnungen der Klasse der Trilobiten.
		Es waren kleine bis sehr kleine Trilobiten von meist nur wenigen Millimetern Länge, mit in der Form sehr ähnlichem Cephalon und Pygidium, typischerweise oft eingerollt.
	www.ratgeber-lexikon.de /informationen/Agnostida.shtml (166 words)

	Agnostida - Education - Information - Educational Resources - Encyclopedia - Music
		Agnostida - Education - Information - Educational Resources - Encyclopedia - Music
		Agnostida (the agnostids) is an order of trilobite.
		The Agnostida are divided into two suborders -- Agnostina and Eodiscina -- that are then divided into a number of families.
	www.music.us /education/A/Agnostida.htm (0 words)

	Lexikonia.de - Informationen zu Agnostida (Site not responding. Last check: )
		Sie haben nach der Definition zum Begriff "Agnostida" gesucht, wir haben für Sie eine passende Erklärung des Begriffes "Agnostida" gefunden.
		Die Agnostida, Salter 1864 stellen eine von gegenwärtig neun anerkannten Ordnung (Biologie) der Klasse (Biologie) der Trilobiten.
		Es waren kleine bis sehr kleine Trilobiten von meist nur wenigen Millimetern Länge, mit in der Form sehr ähnlichem Kopfschild (Cephalon) und Schwanzschild (Pygidium), typischerweise oft eingerollt.
	www.lexikonia.de /170400_agnostida.htm (127 words)

	[No title]
		On the other, they lack a calcified cuticle, evidence of sutures, and the cephalic shield is shorter than the pygidium –; the 'macropygous' condition that is rare among trilobites, and confined exclusively to highly evolved forms (among the Asaphidae and Styginidae).
		Despite their superficial resemblance, they do not appear to be closely related to the Agnostida.
		Cephalic disorders are congenital conditions that stem from damage to, or abnormal development of, the budding nervous system.
	www.lycos.com /info/cephalic--miscellaneous.html?page=2 (488 words)

	†Agnostida
		Shergold, Laurie and Sun, 1990 pro Agnostini Salter, 1864; Miomera Jaekel, 1909; Agnostida Kobayashi, 1935 `--o †Agnostina Salter, 1864 [nom.
		granulatum (Barrande, 1852) [Battus granulatus Barrande, 1852; Dichagnostus granulatus (Barrande) Jaekel, 1909] `--o †Agnostoidea M'Coy, 1849 -- †Agnostidae M'Coy, 1849 [Micragnostidae Howell, 1935; Glyptagnostidae Whitehouse, 1936; Rudagnostidae Lermontova, 1951] -- †Ptychagnostidae Kobayashi, 1939 [synonyms] --o †Spinagnostidae Howell, 1935 [Quadragnostidae Howell, 1935a sensu Öpik, 1979; Cyclopagnostidae Howell, 1937]
		Agnostida sensu lato [Agnostina and Eodiscina] have usually been classified as primitive trilobites.
	www.fmnh.helsinki.fi /users/haaramo/Metazoa/Protostoma/Arthropoda/Crustacea/Agnostida/Agnostida.htm (762 words)

	Systematics of the Trilobites and their Allies (Site not responding. Last check: )
		As traditionally defined, the true Trilobita are divided into two main groups, the Agnostida and the Polymerida.
		Fortey and Theron 1994) support the inclusion of the Agnostida in the Trilobita.
		A third group, the Nektaspida, was not identified until the 1980s; its members include soft-bodied arthropods from the Burgess Shale such as Naraoia.
	www.ucmp.berkeley.edu /arthropoda/trilobita/trilobitasy.html (357 words)

	Trilobite Order Agnostida
		The trilobites of Order Agnostida (pronounced Ag-nós-t-eh-da)appeared in the Lower Cambrian where they were diverse and ubiquitous, and declined to become rare in the Ordovician prior to their complete extinction by the end of the Ordovician.
		Additionally, their diminutive size, low mass and general morphology are hydrodynamically inconsistent with a swimming pelagic mode of life.
		A weight of evidence tends to support that the Agnostida were benthic, but more data are needed; perhaps the little Agnostida made their living in different or multiple ways, depending on their age, or on the paleoenvironment where they lived.
	www.fossilmuseum.net /Fossil_Galleries/Trilobites-Agnostida.htm (0 words)

	High Level Trilobite Systematics
		Discussion: The Agnostida mostly lack eyes – however, the oldest well-preserved trilobite eyes are in fact found in eodiscids from the Lower Cambrian of China (Clarkson 1993, p.
		The Agnostida includes two suborders, the Agnostina and Eodiscina, comprising (to a first order approximation) members having two and three thoracic segments, respectively.
		However, the order may not be a natural clade; it may be paraphyletic.
	www.peripatus.gen.nz /Taxa/Arthropoda/Trilobita/TriSys.html (2651 words)

	Amazon - OrganizedHome.Com (Site not responding. Last check: )
		It is not a complete systematic review of the whole class, however: This is the first volume of a work which is expected to stretch to three.
		Systematic descriptions are given for the Agnostida and Redlichiida only.
		Readers familiar with the 1959 version will first notice that the familiar line drawings have been almost totally replaced by excellent (at least 600 dpi) photographs of actual fossils.
	www.organizedhome.com /bookreview-0813731151.html (421 words)

	Agnostida
		Der Artikel Agnostida gehört zur Kategorie: Gliederfüßer, Ausgestorbenes Tier
		Der Trilobit Peronopsis interstrictus aus der Ordnung Agnostida
		Erklärung des Begriff Agnostida und dessen Bedeutung wurde zuletzt am 20.12.2006 aktualisiert (Glossar Lexikon Enzyklopädie).
	www.xn--enzyklopdie-s8a.de /Agnostida.html (137 words)

	Agnostida . Ordovician
		Superfamily Agnostoidea Agnostidae Ammagnostidae Clavagnostidae Diplagnostidae Doryagnostidae Glyptagnostidae Metagnostidae Peronopsidae Ptychagnostidae Superfamily Condylopygoidea Condylopygidae Suborder Eodiscina Superfamily Eodiscoidea Calodiscidae Eodiscidae Hebediscidae Tsunyidiscidae Weymouthiidae Yukoniidae Agnostida the agnostids is an order biology order of trilobite.
		The Agnostida are divided into two suborders Agnostina and Eodiscina that are then divided into a number of family biology families.
		After a few titles, she moved back to England for almost a year before returning.
	www.uk.kunsimuna.net /Agnostida_UK_195911_hp (371 words)

	Agnostida sur l'encyclopédie Recherche.fr (Site not responding. Last check: )
		Ressources pour l'expression "Agnostida" : 250 jeux gratuits »»
		Les agnostides (ou Agnostida) constitue un ordre de trilobites primitifs.
		Le contenu de cette page (Agnostida) est un minuscule extrait de l'encyclopiédie gratuite en ligne WIKIPEDIA le webmaster de ce site n'est pas l'auteur de cet article (Agnostida).
	www.recherche.fr /encyclopedie/Agnostida (487 words)

	BIOSTRATIGRAPHY
		It is very small, its cephalon ('head') and pygidium ('tail') are approximately equal in size and shape, it has no eyes, and there are exactly two segments in the thorax.
		These characteristics only occur in the Order Agnostida, and this order is only known from Cambrian rocks.
		In this example, a little more effort spent learning to identify the critter one step farther down the taxonomic hierarchy pays off by changing our age estimate from between 530-245 my to between 530-500 my, a reduction in error of nearly 90%!
	itc.gsw.edu /faculty/bcarter/histgeol/paleo2/biostr3.htm (317 words)

	EARLY PARADOXIDID HARLANI TRILOBITE FAUNA OF MASSACHUSETTS AND ITS CORRELATIVES IN NEWFOUNDLAND, MOROCCO, AND SPAIN, ...
		Reinterpretations of Agnostida, based on Newfoundland material associated with P. (Hydrocephalus) harlani, indicate that Condylopyge eli and Kiskinella cf.
		Three trilobite species have been identified, in addition to those recognized in Lord's USNM collection by Geyer and Landing (2001).
		These, together with reinterpretations of two of their Agnostida identifications, endorse correlations made with Cambrian sequences in Morocco, Spain, Newfoundland, Siberia (Fig.
	www.findarticles.com /p/articles/mi_qa3790/is_200503/ai_n11827030 (899 words)

	China Scientific Book Services--Details of Books
		They are quite different from those of the Atlantic or the Acado-Baltic Faunal Province, one of the Occidental Faunal Realms contemporaneous and corresponding to the Southeast China Faunal Province, though many pelagic genera and species of the agnostics and a few nonagnostid trilobites occur in both provinces.
		The Agnostida described here includes 10 families and subfamilies, 32 genera and subgenera, 57 species and 22 undetermined species, among which 1 subgenus and 20 species are new; the non-agnostic trilobites med species, including 1 new subfamily and 17 new species.
		Stratigraphically, the Cambrian System of western Zhebrian strata of W. Zhejiang, Central China, NW China, N. and NE China, Kazakhstan, Australia, Scandinavia and N. America is given.
	www.hceis.com /book.asp?id=845 (179 words)

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