Echinoderms

Echinoderms are marine animals composed of a dermal skeleton with a characteristic pentaradial symmetry. Crinoids are one group of echinoderms and are listed on a previous web page. Other echinoderms include starfish, echinoids, cystoids, edrioasteroids, blastoids, paracrinoids and eocrinoids. Most of the echinoderems pictured here are from the Ordovician Bobcaygeon/Verulam Formations of Ontario. There are a few from other localities.
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Ordovician Echinoderms from Ontario


*Amecystites*	*Amecystites*	*Saltaster*	*Saltaster*	*Foerstediscus*	*Foerstediscus*

*Cryptogoleus*	*Edrioaster*	*Stenaster*	*Stenaster*	*Edriophus*	*Amygdalocystites*

*Glyptocystites*	*Glyptocystites*	*Isorophusella*	*Cyclocystoides*	*Astrocystites*	*Tarquinites*

*Pleurocystites*	*Pleurocystites*	*Ateleocystites*	*Thresherodiscus*	*Astroporites*	*Belemnocystites*

*Amecystites*	*Foerstediscus*	*Edriophus*	*Edrioaster*	*Isorophusella*	*Thresherodiscus*

*Homocystites*	*Ateleocystites*	*Glyptocystites*	*Stenaster*	*Amygdalocystites*	*Isorophusella*

*Protaster*	*Cyclocystoides*	*Saltaster*	*more to come*	*more to come*	*more to come*

Echinoderms from Other localities


*Pentremites*	*Pentremites*	*Caryocystites*	*Gogia*	*Hyperoblastus*	*Carneyella*

*Devonaster*	*Eugasterella*	*Eospondylus*	*Urasterella*	*Pentremites*	*Dexterites*

*Archaeocidaris*	*Orophocrinus*	*Placoblastus*	*Pyramiblastus*	*Castericystis*	*Gogia*

*Hypsiclavus*	*Caryocrinites*	*Pentremites*	*Troosticrinus*	*Archaeocidaris*	*Rhenocystis*

*Eleutherocrinus*	*Nucleocrinus*	*Hyperoblastus*	*more to come*	*more to come*	*more to come*

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