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.

All photographs on these web pages are not to be copied or used for any purpose without my written permission.

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Ordovician Echinoderms from Ontario
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*Amecystis*	*Amecystis*	*Anthroosasterias*	*Anthroosasterias*	*Foerstediscus*	*Foerstediscus*

*Belochthus*	*Edrioaster*	*Stenaster*	*Stenaster*	*Edriophus*	*Amygdalocystites*

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

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

*Amecystis*	*Foerstediscus*	*Edriophus*	*Edrioaster*	*Isorophusella*	*Thresherodiscus*

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

*Protaster*	*Cyclocystoides*	*Anthroosasterias*	*Comarocystites*	*Edrioaster*	*Belochthus*

*Comarocystites*	*Schuchertia*	*Cyclocystoides*	*Protaster*	*Astrocystites*	*Thresherodiscus*

*Sertulaster*	*Sertulaster*	*more to come*	*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*	*Pentremites*	*Geocoma*	*Amber*

*Protaster*	*Protopaleaster*	*Protaster*	*Spinadiscus*	*Nucleocrinus*	*Deltablastus*

*Globoblastus*	*Metablastus*	*Heteroschisma*	*Troosticrinus*	*Caryocystites*	*Hyperoblastus*

*Cheirocystis*	*Calocystites*	*Caryocystites*	*Devonaster*	*Adocetocystis*	*Cardiocystites*

*Deltablastus*	*Loriolaster*	*Agelacrinites*	*Praeaplocoma*	*Krama*	*Tyrridiocystis*

*n. gen., n. sp.*	*Cholaster*	*Paulicystis*	*Protaster*	*Holocystites*	*Triamara*

*Caryocrinites*	*more to come*	*more to come*	*more to come*	*more to come*	*more to come*

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