List of eurypterid genera

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.

[1] 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: Acanthoeurypterus Kjellesvig-Waering

Belinuropsis Matthew 1910 Nomen dubium Carboniferous Too poorly preserved to be assigned to any particular arthropod group.

Bunodella Matthew 1889 Nomen dubium Silurian Uncertain affinities, probably synonym of Acutiramus.

Preoccupied by a genus of plant bugs, changed to Campylocephalus.

Informal name that only appears in notes in museum drawers.

Preoccupied by a genus of flies, synonym of Hallipterus.

Eurypterella Matthew 1888 Nomen dubium Carboniferous Too poorly preserved to be assigned to any particular arthropod group.

Unavailable junior homonym, replaced by name Erettopterus Kockurus Chlupáč 1995 Misidentification