Anderella Moore, McKenzie & Lieberman, 2007 † (verified source for family)
Anderella Moore, McKenzie & Lieberman, 2007 † (current name source)
Bembicosoma Laurie, 1899 † (current name source)
Borchgrevinkium Novojilov, 1958 † (current name source)
Borchgrevinkium Novojilov, 1958 † (verified source for family)
Bunaia Clarke, 1920 † (extant flag source)
Bunodidae Packard, 1886 † (taxonomy source)
Camanchia Moore, Briggs, Braddy & Shultz, 2011 † (verified source for family)
Camanchia Moore, Briggs, Braddy & Shultz, 2011 † (current name source)
Chasmataspidida † (additional source)
Cyamocephalus Currie, 1927 † (current name source)
Cyrtoctenida † accepted as Eurypterida † (source of synonymy)
Eurypterida † (habitat flag source)
Eurypterida † (current name source)
Eurypterida † (extant flag source)
Eurypterida † (name verified source)
Hemiaspis Woodward, 1865 † accepted as Limuloides Woodward, 1865 † (source of synonymy)
Legrandella Eldredge, 1974 † (name verified source)
Legrandella Eldredge, 1974 † (current name source)
Legrandella Eldredge, 1974 † (verified source for family)
Limuloides Woodward, 1865 † (name verified source)
Limuloides Woodward, 1865 † (current name source)
Limuloides Woodward, 1865 † (extant flag source)
Lophodesmus Tesakov & Alekseev, 1992 † accepted as Maldybulakia Tesakov & Alekseev, 1998 † (verified source for family)
Lophodesmus Tesakov & Alekseev, 1992 † accepted as Maldybulakia Tesakov & Alekseev, 1998 † (source of synonymy)
Maldybulakia Tesakov & Alekseev, 1998 † (verified source for family)
Maldybulakia Tesakov & Alekseev, 1998 † (current name source)
Merostomata accepted as Xiphosura (source of synonymy)
Merostomata accepted as Xiphosura (name verified source)
Neolimulus Woodward, 1868 † accepted as Pseudoniscus Nieszkowski, 1859 † (source of synonymy)
Pasternakevia Selden & Drygant, 1987 † (current name source)
Pseudoniscidae Packard, 1886 † (taxonomy source)
Pseudoniscus Nieszkowski, 1859 † (current name source)
Venustulus Moore in Moore et al., 2005 † (current name source)
Venustulus Moore in Moore et al., 2005 † (extant flag source)
Venustulus Moore in Moore et al., 2005 † (basis of record)
Venustulus Moore in Moore et al., 2005 † (verified source for family)
Venustulus Moore in Moore et al., 2005 † (name verified source)
Weinbergina Richter & Richter, 1929 † (current name source)
Weinbergina Richter & Richter, 1929 † (verified source for family)
Weinberginidae Richter & Richter, 1929 † accepted as Chelicerata (status source)
Willwerathia Størmer, 1969 † (verified source for family)
Willwerathia Størmer, 1969 † (current name source)
Xiphosurida (taxonomy source)
Xiphosurida (name verified source)
Xiphosurida (basis of record)
Xiphosurida (current name source)
Xiphosurida (extant flag source)
Xiphosurida (habitat flag source)

 Taxonomic remark

 for Bunodidae Packard, 1886 †

Previously allocated to Xiphosura, however appear to be a sister taxon to that group. Lamsdell, 2012 states: ... [details]

 Taxonomic remark

 for Chasmataspidida †

Previously included in Xiphosura. Lamsdell, 2012 states: Xiphosura sensu stricto is itself the sister group to a ... [details]

 Taxonomic remark

 for Merostomata

From Lamsdell, 2012: Merostomata was originally proposed by Dana (1852) as consisting solely of Xiphosura but later ... [details]

 Taxonomic remark

 for Pseudoniscidae Packard, 1886 †

Previously allocated to Xiphosura, however appear to be a sister taxon to that group. Lamsdell, 2012 states: ... [details]

 Taxonomic remark

 for Weinberginidae Richter & Richter, 1929 †

Lamsdell, 2012 cites the "now defunct Weinberginidae" and places Weinbergina and allied forms in a "grade" in ... [details]

 Taxonomic remark

 for Xiphosurida

New class name for most xiphosurids, in conjunction with treatment of "Xiphosura" as order, not class (=former ... [details]