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Echinoderms

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Crinoids (8)

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	Discovering Fossils: What is an Echinoid? - http://www.discoveringfossils.co.uk/echinoids.htm Provides photographs and information on echinoids, or sea urchins, the arrival of regular species in the fossil record in the Cambrian and the appearance of irregular ones in the Jurassic.
	Peer's Echinoid Pages - http://members.home.nl/thebus/ Information about and images of echinoids from the Cretaceous Period (Maastrichtian) from the Netherlands.
	9th International Echinoderm Conference - http://www.calacademy.org/research/izg/echinoderm/conference/ Links to abstracts.
	Jurassic Echinoids - http://www.christraxon.pwp.blueyonder.co.uk/jurassic%20echinoids.htm Photographs of several fine specimens found in the UK.
	Hemicidaris mantochensis - http://www.nhm.ac.uk/research-curation/projects/echinoid-directory/taxa/taxon.jsp?id=1982 Several photographs of fossilised tests of this echinoid, found at Portlandian, France.

	Holectypus hemisphaericus - http://internt.nhm.ac.uk/jdsml/nature-online/earthlab/specimen/fossil.dsml?name=Holectypus%20hemisphaericus&Panel=13&Row=F&Column=7 Images of this echinoid from the Middle Jurassic, found at Beaminster, UK.
	Archaeocidaris urii - http://internt.nhm.ac.uk/jdsml/nature-online/earthlab/specimen/fossil.dsml?name=Archaeocidaris%20urii&Panel=6&Row=A&Column=7 Image of fossilised spines of this echinoid from the Early Carboniferous, found in Cumbria, UK.
	Clypeus plotii - http://internt.nhm.ac.uk/jdsml/nature-online/earthlab/specimen/fossil.dsml?name=Clypeus%20plotii&Panel=13&Row=F&Column=9 Photograph of a fine specimen of this irregular echinoid from the Middle Jurassic.
	Micraster coranguinum - http://internt.nhm.ac.uk/jdsml/nature-online/earthlab/specimen/fossil.dsml?name=Micraster%20coranguinum&Panel=16&Row=D&Column=9 Photographs of this irregular echinoid from the Late Cretaceous, found in Croydon, UK.

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