List Of Prehistoric Echinoderms
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. The list includes thousands of genera. *Extinct genera are marked with a dagger ( †). *Extant genera are bolded. Naming conventions and terminology Naming conventions and terminology follow the International Code of Zoological Nomenclature. Technical terms used include: * Junior synonym: A name which describes the same taxon as a previously published name. If two or more genera are formally designated and the type specimens are later assigned to the same genus, the first to be pub ...
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Agaricocrinus Splendens (Crinoid)
''Agaricocrinus'' is a genus of Extinction, extinct crinoids, belonging to the family Coelocrinidae. These stationary upper-level epifaunal suspension feeders lived in the Carboniferous period and in the Osagean age of United States, from 353.8 to 345.0 Ma. Selected species *''Agaricocrinus americanus'' Roemer *''Agaricocrinus splendens'' Miller and Gurley Description Like Extant taxon, extant crinoids, ''Agaricocrinus'' species was anchored to a hard surface by a holdfast (biology), holdfast out of which grew an articulated stalk. On top of this was a Calyx (anatomy), calyx with a number of feather-like arms. Each arm bore short branches known as pinnules and from these cirri were extended which sifted plankton from the water flowing past. References

Prehistoric crinoid genera Carboniferous crinoids Extinct animals of the United States {{paleo-crinoidea-stub ...
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