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Topic: Yarnemia

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Tunicata

Jurassic

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	Urochordata
		Some forms have a calcereous spicule that may be preserved as a fossil.
		Jurassic to Present with one proposed Neoproterozoic form - Yarnemia.
		Some workers class the Urochordates as a subphylum of the chordata.
	www.ebroadcast.com.au /lookup/encyclopedia/ur/Urochordata.html (65 words)

	Introduction to the Urochordata (Site not responding. Last check: 2007-11-03)
		Some tunicates are entirely pelagic; known as salps, they typically have barrel-shaped bodies and may be extremely abundant in the open ocean.
		A Precambrian fossil known as Yarnemia has been referred to the Urochordata, but this assignment is doubtful.
		Complete body fossils of tunicates are rare, but tunicates in some families generate microscopic spicules that may be preserved as microfossils.
	www.ucmp.berkeley.edu /chordata/urochordata.html (209 words)

	YARNEMIA (Site not responding. Last check: 2007-11-03)
		Yarnemia è un fossile dubbio classificato nella famiglia di urochordata.
		Mentre i urochordates ed il yarnemia sembrano simili, il più vecchio urochordate comune-accettato data al periodo jurassic, mentre il yarnemia è precambriano.
		It is licensed under the GNU free documentation license.
	www.facteri.com /wiki/it/ya/Yarnemia.htm (50 words)

	Yarnemia - Wikipedia, the free encyclopedia
		Yarnemia is a fossil dubiously classified in the urochordata family.
		While urochordates and yarnemia look similar, the oldest commonly-accepted urochordate dates to the Jurassic period, while yarnemia is precambrian.
		This page was last modified 07:08, 12 May 2005.
	www.wikipedia.org /wiki/Yarnemia (61 words)

	[No title] (Site not responding. Last check: 2007-11-03)
		Because they are soft-bodied animals, tunicates have left little fossil record (Jurassic) apart from the hard mineral particles, called spicules that are found in the tunics of some species.
		The fossil Yarnemia from the Precambrian has been suggested as a urochordate, but this is doubtful.
		Summary: The prechordate ancestor was probably a primitive, sessile echinoderm, which used tentacles for filter feeding.
	www.cbu.edu /~esalgado/BIOL246/ch17.doc (6050 words)

	yarnemia - Synonyms from Thesaurus.com
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	www.reference.com /go/http://thesaurus.reference.com/search?q=yarnemia (35 words)

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