e/List of prehistoric echinoderms

Information
has gloss	eng: This list of prehistoric echinoderms is an attempt to create a comprehensive listing of all genera that have ever been included in the Echinoderms that have been preserved as fossils. This list excludes purely vernacular terms. It includes all commonly accepted genera, but also genera that are now considered invalid, doubtful (nomina dubia), or were not formally published (nomina nuda), as well as junior synonyms of more established names, and genera that are no longer considered echinoderms.
lexicalization	eng: List of prehistoric echinoderms
instance of	(noun) radially symmetrical marine invertebrates including e.g. starfish and sea urchins and sea cucumbers Echinodermata, phylum Echinodermata

Media
media:img	Agaricocrinus splandens (Crinoid).jpg
media:img	Echinosphaerites.JPG
media:img	Uperocrinus nashvillae (Crinoid).jpg