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Topic: Naraoiidae

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	Naraoiidae - Wikipedia, the free encyclopedia
		The Naraoiidae is a family of soft-shelled trilobite-like arthropods that are known only from the early and middle Cambrian -- primarily from the Burgess Shale of British Columbia and the Maotianshan Shale of China.
		The taxonomic placement of the Naraoiidae is uncertain; Naraoiids are similar to trilobites in many ways but have several peculiar features unlike those of other trilobite groups, primarily their unmineralized exoskeleton and few to no thoracic segments.
		Some specialists consider the Naraoiidae true trilobites of the order Nectaspida, others consider them trilobites of uncertain ordinal status, and still others consider them a separate group of non-trilobite arthropods.
	en.wikipedia.org /wiki/Naraoiidae (196 words)

	Naraoiidae (Site not responding. Last check: 2007-10-14)
		The Naraoiidae is a family of soft-shelled trilobite-like arthropods that are known only from the Early and Middle Cambrian-primarily from the Burgess Shale of British Columbia and the Maotianshan Shale of China.
		Some specialists consider the Naraoiidae true trilobites of an order Nectaspida, others consider them trilobites of uncertain ordinal status, and still others consider them a separate group of non-trilobite arthropods.
		A second softbodied trilobite-Tegopelte-is known from the same formations and is sometimes placed in the Naraoiidae and sometimes in its own family, the Tegopeltidae.
	www.yotor.com /wiki/en/na/Naraoiidae.htm (180 words)

	are Naraoids trilobites?
		The proposal to include both Naraoiidae and Agnostida in the Class Trilobita is fraught with controversy.
		Moreover, in those analyses, the Tegopeltidae are removed from the Naraoiidae, since the Chengjiang tegopeltid Saperion clearly bears ventral eyes on stalks.
		Agnostida arguably represents a secondary loss of eyes, reduction in size and segment number, and specialization of limb form and function within the trilobite clade, while the Naraoiidae never developed dorsal eyes, calcified exoskeletons, or the numerous segments of the typical trilobite, yet share the primitive limb form of most arachnomorphs, including trilobites.
	www.trilobites.info /naraoia.htm (1221 words)

	Journal of Paleontology: A NEW LATE SILURIAN (PRIDOLIAN) NARAOIID (EUARTHROPODA: NEKTASPIDA) FROM THE BERTIE FORMATION ... (Site not responding. Last check: 2007-10-14)
		Some authors have argued that the length of the posterior shield in the nektaspids is a function of the number of segments released from the front of the posterior shield (Budd, 1999).
		Thus, the posterior shield of the Naraoiidae could be considered to represent the "transitory posterior shield" of trilobites during early larval stages (meraspid) and implies a heterochronic origin (see Budd, 1999, p.
		The absence of articulated trunk segments is an apomorphy of the family Naraoiidae that distinguishes it from all other nektaspids.
	www.findarticles.com /p/articles/mi_qa3790/is_200411/ai_n9461523/pg_2 (1275 words)

	Trilobite Classification Chart
		In several recent cladistical analyses, helmetiids emerge as the arachnomorph clade most similar to trilobites, displacing the Naraoiidae as the clade nearest to trilobites, and suggesting that the idea of naraoiids as a "ninth order" of trilobites should probably be set aside.
		When Naraoia compacta was described, its similarity to an early meraspid trilobite (with cephalon and pygidium, but no thoracic segments) was noted, and was part of an ontogenetic argument for including Naraoia as a "soft-bodied trilobite." A fuller discussion of the relationship of naraoiids to trilobites is presented on a separate page of this website.
		The family Liwiidae (sometimes subfamily Liwiinae of the family Naraoiidae) is comprised of naraoiid-like species that are distinguished from naraoiids in bearing thoracic tergites.
	www.trilobites.info /triloclass.htm (2944 words)

	Order Nectaspida
		The prevailing view is that the Nectaspida are a sister group to the clade which includes the calcified trilobites.
		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.
		The extension of the range of the Naraoiidae, and the Nektaspida, from the Late Ordovician to the Late Silurian (some 25 million years) has both ecologic and phylogenetic implications.
	www.peripatus.gen.nz /Taxa/Arthropoda/Trilobita/Nectaspida.html (1487 words)

	Soft Bodied Trilobite Misszhouiae
		Two large groupings of the Paleozoic arthropods are currently in favor: the Crustaceomorpha (which includes Waptia) and the Arachnomorpha, dominated by the trilobites.
		The Naraoiidae are arachnomorphs and include Misszhouia and Naraoia.
		Misszhouia longicaudata was initially placed within Naraoia, but was given its own genus based upon differences between it and Naraoia compacta of the Burgess Shale.
	www.fossilmall.com /EDCOPE_Enterprises/Chengjiang/CJF016/CJF016.htm (452 words)

	Naraoiidae
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		The Naraoiidae is a family of soft-shelled trilobite-like arthropods that are known only from the Early and Middle Cambrian—primarily from the Burgess Shale of British Columbia and the Maotianshan Shale of China.
		A second softbodied trilobite—Tegopelte—is known from the same formations and is sometimes placed in the Naraoiidae and sometimes in its own family, the Tegopeltidae.
	www.sciencedaily.com /encyclopedia/naraoiidae (236 words)

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