List of prehistoric medusozoan genera

This list of prehistoric medusozoan genera is an attempt to create a comprehensive listing of all genera that have ever been included in the subphylum Medusozoa, excluding purely vernacular terms.

The list 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 medusozoans.

Naming conventions and terminology follow the International Code of Zoological Nomenclature.

Technical terms used include:

The 8th plate from Ernst Haeckel 's Kunstformen der Natur (1904), depicting Discomedusae .
Some Karakorum stones ( Stoliczkaria and Syringosphaera ), relatives of Heterastridium .
Fish surrounding a modern Millepora species.
Fish near a modern Millepora species.
Modern Millepora near Fiji .