Classification of Lamsdell 2013

Subph. Chelicerata Heymons 1901
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Euchelicerata Weygoldt and Paulus 1979
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Prosomapoda Lamsdell 2013
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G. †Borchgrevinkium Novojilov 1958
Cl. Xiphosura Latreille 1802
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G. †Maldybulakia Tesakov and Alekseev 1998
Or. Xiphosurida Latreille 1802
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Planaterga Lamsdell 2013
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G. †Bembicosoma Laurie 1899
G. †Bunaia
G. †Bunodes
Dekatriata Lamsdell 2013
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Or. †Chasmataspidida Caster and Brooks 1956
Sclerophorata Kamenz et al. 2011
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Cl. Arachnida Lamarck 1801
Or. †Eurypterida Burmeister 1843 [eurypterid]
G. †Limuloides Woodward 1865
G. †Pasternakevia Selden and Drygant 1987
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Invalid names: Neolimulus [synonym]
Invalid names: Merostomata Dana 1852 [synonym]
Invalid names: Synziphosurina Packard 1886 [invalid subgroup]