List of xiphosuran genera

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, genera that are no longer considered xiphosurans and misspellings.

The list currently includes 54 names out of which 31 are considered valid xiphosuran genera.

There is no "official" or "canonical" list of xiphosuran genera.

The closest thing is found contained in the regularly updated Summary list of fossil spiders and their relatives in the World Spider Catalog, which include just the extinct species.

The vast majority or all of the content of the list below, including the valid genera, preoccupied names, junior synonyms, misspellings, taxonomical classifications and sites of discovery, is based upon the 2019 edition of the summary list.

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

Technical terms used include: † = Extinct †Belinuropsis Matthew 1910 Nomen dubium Carboniferous Too poorly preserved to be assigned to any particular arthropod group.

Invalid name, Belinurus (Bronn, 1839) has priority.

†Eolimulus Moberg 1892 Nomen dubium Cambrian †Heterolimulus Via Boada & Villalta 1966 Jr. synonym

†"Veltheimia" Beyschlag & von Fritsch 1899 Nomen nudum Carboniferous?