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Topic: Helioplacus

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	Helioplacus: Definition and Links by Encyclopedian.com
		...Helioplacus Helioplacus Helioplacus is the earliest well studied echinoderm....such as starfish, helioplacus does not have five fold symmetry.
		Instead, there is a spiral food groove on the outside along which food was moved to a mouth that is thought to be located on the top.
		Other contemporaneous echinoderms are known to have existed from their dissociated plates, but other than a few possible edrioasteroids, helioplacus is the earliest echinoderm that is well enough preserved to analyze its characteristics.
	www.encyclopedian.com /he/Helioplacus.html (399 words)

	Echinoderm - the free encyclopedia (Site not responding. Last check: 2007-11-01)
		Ophuiroidea (brittlestars and basket stars), thelargest class of echinoderms.
		Fossil forms included Blastoids, Edrioasteroids and several peculiarEarly Cambrian animals such as Helioplacus, Carpoids,Homalozoa and possibly Machaerids.
		Echinoderms' larvae are ciliated free-swimming organisms thatorganize in a bilaterally symmetric fashion that makes them look like embryonic chordates.
	www.the-free-web-encyclopedia.com /default.asp?t=Echinodermata (458 words)

	NationMaster - Encyclopedia: Echinodermata
		Ophuiroidea (brittle stars and basket stars), the largest class of echinoderms.
		Fossil forms included Blastoids, Edrioasteroids and several peculiar Early Cambrian animals such as Helioplacus, Carpoids, Homalozoa and possibly Machaerids.
		Echinoderms' larvae are ciliated free-swimming organisms that organize in a bilaterally symmetric fashion that makes them look like embryonic chordates.
	www.nationmaster.com /encyclopedia/Echinodermata (652 words)

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