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


*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*	*Zygocycloides*	*Anthroosasterias*	*Comarocystites*	*Edrioaster*	*Belochthus*

*Comarocystites*	*Schuchertia*	*Brechincycloides*	*Protaster*	*Astrocystites*	*Thresherodiscus*

*Sertulaster*	*Sertulaster*	*Brechincycloides*	*Nicholsodiscus*	*Zygocycloides*	*Nicholsodiscus*

*Glyptocystites*	*Hudsonaster*	*Belochthus*	*more to come*	*more to come*	*more to come*

Echinoderms from Other localities


*Caryocystites*	*Caryocystites*	*Lipsanocystis*	*Gogia*	*Lipsanocystis*	*Carneyella*

*Devonaster*	*Eugasterella*	*Eospondylus*	*Urasterella*	*Caryocrinites*	*Dexterites*

*Archaeocidaris*	*Archaeocidaris*	*Rhenocystis*	*Castericystis*	*Gogia*	*Hypsiclavus*

*Protaster*	*????????*	*Protaster*	*Spinadiscus*	*Geocoma*	*Amber*

*Lipsanocystis*	*Lepidesthes*	*Protaster*	*Spinadiscus*	*Geocoma*	*Amber*

BLASTOIDS


*Pentremites*	*Pentremites*	*Hyperoblastus*	*Pentremites*	*Diploblastus*	*Placoblastus*

*Pyramiblastus*	*Pentremites*	*Troosticrinus*	*Eleutherocrinus*	*Nucleocrinus*	*Hyperoblastus*

*Pentremites*	*Orophocrinus*	*Nucleocrinus*	*Deltablastus*	*Globoblastus*	*Metablastus*

*Nucleocrinus*	*Placoblastus*	*Nucleocrinus*	*Deltablastus*	*Globoblastus*	*Placoblastus*

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