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Topic: Trilobita

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	Palaeontology - Research - What are Trilobites?
		The group Trilobita existed from early in the Cambrian Period (520 million years ago) until the end of the Permian Period (250 million years ago).
		The name Trilobita is derived from the three (tri-) lobed structure of the exoskeleton, which has a raised central lobe (or axis) and a pair of side lobes, called pleurae.
		The trilobite body is also divided lengthwise into three regions or tagmata: a head or cephalon, a middle region (thorax) composed of several to many articulated segments, and a tail plate called a pygidium, which consists of fused segments.
	www.austmus.gov.au /palaeontology/research/trilobites02.htm (970 words)

	Journal of Paleontology: Relationships of Cambrian Arachnata and the systematic position of Trilobita (Site not responding. Last check: 2007-11-05)
		ABSTRACT-Cladistic relationships of Trilobita, Naraodae (five ingroup taxa), Helmetda (five ingroup taxa), Xandarellida, and the Cambrian arachnates Retifacies, Sinoburius, Emeraldella, and Sidneyia are investigated based on 29 characters.
		Trilobita.-The traditional concept of Trilobita (e.g., Moore, 1959) restricts this taxon to "Olenellida" (a paraphyletic group; Geyer, 1996) and Trilobita sensu Lauterbach (1980), i.e., Emuellida + Eutrilobita.
		Apart from upholding convention, this scope for Trilobita has merit because such a clade can be diagnosed by a substantial body of character evidence (Fortey and Whittington, 1989; Ramskold and Edgecombe, 1991; Hou and Bergstrom, 1997).
	www.findarticles.com /p/articles/mi_qa3790/is_199903/ai_n8838221 (1395 words)

	Trilobita (Site not responding. Last check: 2007-11-05)
		Trilobita are a group of extinct marine arthropods.
		Trilobita are members of the phylum Arthropoda, segmented animals which have an external skeleton consisting of chitin (sometimes strengthened by calcium.) This external skeleton is called exoskeleton or carapace.
		Figure 1: The morphology of Trilobita, Acasta downingiae from the Silurian of England.
	www.regional-geology.nl /Paleo/trilobites2.htm (595 words)

	Lab 4 – Ecdysozoa - Arthropoda
		Trilobita – The Trilobita are an extinct group of chelicerate-like arthropods.
		Trilobita are segmented animals with a chitinous exoskeleton and jointed appendages.
		Trilobita originated approximately 540 myr bp and went extinct 245 myr bp.
	userwww.sfsu.edu /~efc/classes/biol170/lab/Laboratory4.htm (1259 words)

	Trilobite Origins
		Ediacaran forms such as Spriggina bear a superficial resemblance to the early trilobites, to date the detailed case for such an ancestry is far from compelling.
		Naraoiid monophyly is well-supported, forcing notions of a "nektaspid" grade as "soft-bodied trilobite" ancestors to be abandoned.
		The three-taxon statement (Naraoiidae) (Trilobita) (Helmetiidae + Tegopeltidae) remains unresolved, with different characters favouring each resolution: the style of hypostome attachment and edge-to-edge tergite articulation are shared by helmetiids and trilobites, whereas an ovate pre-hypostomal sternite that bears paired "frontal organs" is apparently unique to naraoiids, helmetiids, and tegopeltids.
	www.peripatus.gen.nz /taxa/arthropoda/Trilobita/TriOri.html (1344 words)

	Order Nectaspida
		The prevailing view is that the Nectaspida are a sister group to the clade which includes the calcified trilobites.
		The revised Treatise adopts the tactic of treating the naraoiids as a family within the class Trilobita, order "uncertain," thereby acknowledging a systematic position within the class, but allowing the formal definition of Trilobita to be based upon the characters of calcified forms (Fortey 1997, p.
		Nektaspids, along with helmetiids and tegopeltids, comprise a small group of early Palaeozoic euarthropods lacking calcified exoskeletons that figure prominently in discussions on the origin and composition of the Class Trilobita.
	www.peripatus.gen.nz /taxa/arthropoda/Trilobita/Nectaspida.html (1487 words)

	Journal of Paleontology: Siluro-Devonian scutelluinae (Trilobita) from the Czech Republic: Morphology and classification (Site not responding. Last check: 2007-11-05)
		Journal of Paleontology: Siluro-Devonian scutelluinae (Trilobita) from the Czech Republic: Morphology and classification
		Siluro-Devonian scutelluinae (Trilobita) from the Czech Republic: Morphology and classification
		Illaenidae (Trilobita): Morphology of thorax, classification, and mode of life.
	www.findarticles.com /p/articles/mi_qa3790/is_199905/ai_n8839436/pg_10 (257 words)

	The Trilobites (Subphylum Trilobita Phylum Arthropoda)
		Here the Arthropoda are a phylum which is divided into at least 4 subphyla, three of which are still extant (have living members); Chelicerata, Crustacea and Uniramia (See Arthropoda).
		The trilobites are included in a separate subphylum called Trilobitomorpha (Trilobite like animals), within which the trilobites comprise a class, class Trilobita, this class in turn contains 8 orders.
		While trilobites, with there obvious successfulness as a group of animals, continue to fascinate many people, and even though modern research techniques continue to improve there is still much about the ordinary everyday lives of trilobites that remains a mystery.
	www.earthlife.net /inverts/trilobita.html (1694 words)

	about Trilobites
		Reading Fortey's book, you can almost feel the author's sadness that these magnificent animals that once dominated life on Earth, declined near the end of the Paleozoic with but a single order surviving to the Carboniferous, before it too faded away.
		The scientific bible for Subphylum Trilobita are books within the prodigious Treatise on Invertebrate Paleontology, Volume O, published and sold by the Geological Society of America through the University of Kansas (usually just called "the Treatise" by trilobite aficionados).
		In a major effort, Trilobita is under revision.
	fossilmall.com /Science/About_Trilobites.htm (849 words)

	The trilobites of the class TRILOBITA of division Arthropoda
		The trilobites of the class TRILOBITA of division Arthropoda
		Starting at the ending of Upper Ordovician until Permian, there was a steadily decreasing of the representatives of Trilobita regarding diversity and numerical abundance.
		With the mass extinction at Permian's end, appreciately 75- 90% affected species of Animalia, Trilobita finally going down as extinct class of Arthropoda.
	www.wir-trilobiten.de /TRILOBITA_e.htm (165 words)

	Links (e)
		The visitor is guided via pages by the valid orders of TRILOBITA, their morphology and palaeobiology, didactical famous elaborated.
		Though the classification within the orders of TRILOBITA is presented in a high professional way, it's still easy to understand.
		It's safe to say, TRILOBITAS theory is very exciting, but if one's starting to blow his studies in theory, that will lead to soliloquizing and book nuzzling inevitably.
	www.wir-trilobiten.de /Links_e.htm (809 words)

	ConceptArt.org Forums - 'SIREN' CONCEPTART 2 /- Trilobita warrior / Paguridae knight
		'SIREN' CONCEPTART 2 /- Trilobita warrior / Paguridae knight
		Everyone should take example (I'm not saying COPY but reach a similar level of ingenuity !).
		Your Trilobita warrior is now sitting right next to the Lama-knight / gas-witch
	www.conceptart.org /forums/showthread.php?t=5396 (193 words)

	ConceptArt.org Forums - 'SIREN' CONCEPTART 2 /- Trilobita warrior / Paguridae knight
		- - 'SIREN' CONCEPTART 2 /- Trilobita warrior / Paguridae knight (http://www.conceptart.org/forums/showthread.php?t=5396)
		Your Trilobita warrior is now sitting right next to the Lama-knight / gas-witch :)
		April 30th, 2003 02:49 AM dodowa, sadly that doug chiang was a fake, and is now banned.
	www.conceptart.org /forums/printthread.php?t=5396 (287 words)

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