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Topic: Nectocaris

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	Nectocaris
		The pair of short straight appendages on the front of the head appear to be unjointed.
		Other than this single fossil, there is no reason to think that the two phyla are closely related.
		The text of this article is licensed under the GFDL.
	www.ebroadcast.com.au /lookup/encyclopedia/ne/Nectocaris.html (244 words)

	Nectocaris: Encyclopedia topic (Site not responding. Last check: 2007-10-12)
		Nectocaris is the fossil of an animal of unknown affinity from the Middle Cambrian (Cambrian: From 544 million to about 500 million years ago; marine invertebrates) Burgess Shale (Burgess Shale: the burgess shale (named after mount burgess, near where the shale was found) is a fl...
		The curious combination of arthropod (arthropod: Invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin) and vertebrate (vertebrate: Animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium) characteristics in Nectocaris has aroused a lot of interest.
		Vertebrates (Vertebrates: Animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium) are thought to be more closely related to echinoderms (echinoderms: Marine invertebrates with tube feet and calcite-covered five-part radially symmetrical bodies).
	www.absoluteastronomy.com /reference/nectocaris (436 words)

	nectocaris
		This is the exact dilemma that paleontologists face with the classification of Nectocaris pteryx, another curious organism of the Burgess Shale.
		he body of Nectocaris is suggestive of an active, swimming predator due to its flat shape and fins.
		The rarity of Nectocaris fossils could be explained by this mode of locomotion.
	www.as.wvu.edu /~kgarbutt/EvolutionPage/Studentsites/Burgesspages/nectocaris.html (259 words)

	Nectocaris (Site not responding. Last check: 2007-10-12)
		The head has two eyes one two pairs of appendages and an oval carapace or shield at the rear.
		The pair of short straight on the front of the head appear be unjointed.
		The curious combination of arthropod and vertebrate characteristics in Nectocaris has aroused a lot of interest.
	www.freeglossary.com /Nectocaris (196 words)

	NECTOCARIS (Site not responding. Last check: 2007-10-12)
		Other than this single fossil, there is no reason to think that these two phyla are closely related.
		Vertebrates are thought to be more closely related to echinoderms.
		It is licensed under the GNU free documentation license.
	www.yotor.org /wiki/en/ne/Nectocaris.htm (252 words)

	Cambrian Primitive Chordate Fossil
		This specimen has some similarities to a Nectocaris, an extremely rare animal of unassigned phylum found in the Burgess Shale.
		The description of Nectocaris is based on a single specimen and is thought to be a hemichordate, chordate, possibly an arthropod, remotely possibly a crustacean, or very likely something else.
		It is postulated to have been a free swimming animal with no hard parts; a pair of short straight appendages on the front of the head appear to be unjointed.
	www.fossilmall.com /Fossil_Archive/Western_Fossils/Cambrian_Animals/SB002/SB02.htm (439 words)

	Reconstructions of the Burgess Shale Fauna
		The purple bristled worm-like form is Canadia, a 2-5 centimeter long polychaete annelid.
		The reddish swimming form on the right is Nectocaris, an organism of unknown affinity.
		Several specimens of Dinomischus dot the seafloor, while the jellyfish-like gelatinous possible echinoderm (or cnidarian) Eldonia navigates the water column.
	palaeo.gly.bris.ac.uk /Palaeofiles/Lagerstatten/Burgess/gallery.html (1036 words)

	User Posts (Site not responding. Last check: 2007-10-12)
		The notochord can be seen, but this isn't just like a spinal cord, nor should the appearance of one come as a surprise while looking in the Cambrian, there are other notochords present in earlier fossils
		See: Nectocaris, Myllokummingia (another simular fish), and Agnatha ('fish' from the burgess shale)
		Quoting Darwin's view of the fossil record isn't exactly meaningful.
	www.freerepublic.com /focus/user-posts?id=162240 (564 words)

	Burgess Shale - EvoWiki (Site not responding. Last check: 2007-10-12)
		The Burgess Shale yielded a large collection of well preserved marine Cambrian organisms, from a time shortly (in geological time) after the "Cambrian explosion", a unique period of time when multicellular life was diversifying rapidly.
		Some genre unique to the Burgess fauna or rocks of Burgess age include Marella, Yohoia, Wiwaxia, Anomalocaris, Opabinia, Burgessia, Naraoia, Aysheaia, Odontogriphus, Dinomiscus, Amiskwia, Hallucigenia, Branchiocaris, Canadaspis, Sidneyia, Odaraia, Molaria, Habelia, Sarotrocercus, Actaeus, Alalcomenaeus, Emeraldella, Leanchoilia, Santacaris and Nectocaris.
		Gould, S. Wonderful Life, Random House ISBN 0099273454
	wiki.cotch.net /index.php/Burgess_Shale (240 words)

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