This list of eurypterid genera is a comprehensive listing of all genera that have ever been included in the order Eurypterida, excluding purely vernacular terms. The list includes all commonly accepted genera, but also genera that are now considered invalid, doubtful ("nomen dubium"), or were not formally published ("nomen nudum"), as well as junior synonyms of more established names and genera that are no longer considered eurypterids. The list currently includes 115 names out of which 74 are considered valid eurypterid genera.
There are approximately 250 species of eurypterids recognized as valid.
Naming conventions and terminology.
There is no "official" or "canonical" list of eurypterid genera. The closest thing is found contained in the regularly updated "Summary list" "of fossil spiders and their relatives" in the World Spider Catalog. The vast majority of the content of the list below, including the valid genera, preoccupied names, junior synonyms, taxonomical classifications and sites of discovery, is based upon the 2018 edition of the "Summary list". Content not based on the list, such as genera described after its publication, is noted through inline citations.
Naming conventions and terminology follow the International Code of Zoological Nomenclature. Technical terms used include:
Eurypterid genera.
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References.
Citations.
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