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 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 published (in chronological order) is the senior synonym, and all other instances are junior synonyms. Senior synonyms are generally used, except by special decision of the ICZN, but junior synonyms cannot be used again, even if deprecated. Junior synonymy is often subjective, unless the genera described were both based on the same type specimen. Nomen nudum (Latin for "naked name"): A name that has appeared in print but has not yet been formally published by the standards of the ICZN. Nomina nuda (the plural form) are invalid, and are therefore not italicized as a proper generic name would be. If the name is later formally published, that name is no longer a nomen nudum and will be italicized on this list. Often, the formally published name will differ from any nomina nuda that describe the same specimen. Nomen oblitum (Latin for "forgotten name"): A name that has not been used in the scientific community for more than fifty years after its original proposal. Preoccupied name: A name that is formally published, but which has already been used for another taxon. This second use is invalid (as are all subsequent uses) and the name must be replaced. As preoccupied names are not valid generic names, they will also go unitalicized on this list. Nomen dubium (Latin for "dubious name"): A name describing a fossil with no unique diagnostic features. As this can be an extremely subjective and controversial designation, this term is not used on this list.
The list Genus Class Status Age Location Description Images †Anthracomedusa Cubozoa. Valid. †Archaeoantennularia Hydrozoa. Valid. †Archaeocryptolaria Hydrozoa. Valid. †Archaeolafoea Hydrozoa. Valid. †Archaeonectris Hydrozoa. Valid. †Astya Hydrozoa. Valid. †Auroralumina Incertae Sedis Valid. †Axopora Hydrozoa. Valid. †Axoporella Hydrozoa. Valid. †Cályxhydra Hydrozoa. Valid. †Cannostomites Scyphozoa. Valid. †Congregopora Hydrozoa. Valid. †Conopora Hydrozoa. Valid. †Crucimedusina Hydrozoa. Valid. †Diamantopora Hydrozoa. Valid. †Discophyllum Hydrozoa. Valid. Distichopora Hydrozoa. Valid. †Drevoôella Hydrozoa. Valid. †Eisenackiella Hydrozoa. Valid. †Epiphyllina Scyphozoa. Valid. †Essexella Scyphozoa. Invalid. †Errina Hydrozoa. Valid. †Flexihydra Hydrozoa. Valid. †Gelenoptron Hydrozoa. Valid. †Germanicum Scyphozoa. Valid. †Haootia Staurozoa Valid. †Heterastridium Hydrozoa. Valid. Hydractinia Hydrozoa. Valid. †Hydrallmania Hydrozoa. Valid. †Inocaulis Hydrozoa. Valid. †Kristinella Hydrozoa. Valid. †Kullingia Hydrozoa. Valid. †Lorenzinia Scyphozoa. Valid. †Mamsetia Staurozoa. Valid. †Mazohydra Hydrozoa. Valid. †Mesokylix Hydrozoa. Valid. †Milleaster Hydrozoa. Valid.Millepora Hydrozoa. Valid. †Octomedusa Scyphozoa. Valid. †Palaeacmea Hydrozoa. Valid. †Palaelophacmaea Hydrozoa. Valid. †Palaeokylix Hydrozoa. Valid. †Palaeomillepora Hydrozoa. Valid. †Palaeonectris Hydrozoa. Valid. †Palaeotuba Hydrozoa. Valid. †Parleria Hydrozoa. Valid. †Philippinactinia Hydrozoa. Valid. †Plectodiscus Hydrozoa. Valid. †Pliobothrus Hydrozoa. Valid. †Protohalecium Hydrozoa. Valid. †Protolyella Hydrozoa. Valid. †Protulophila Hydrozoa. Valid. †Psammactinia Hydrozoa. Valid. †Quadrimedusina Cubozoa. Valid. †Rhabdohydra Hydrozoa. Valid. †Sphenoecium Hydrozoa. Valid. †Sporadopora Hydrozoa. Valid. †Stylaster Hydrozoa. Valid. †Subaxopora Hydrozoa. Valid.
See also List of prehistoric hexacorals List of prehistoric octocorals
References