Classification of Dunlop et al. 2003

Ph. Arthropoda Latreille 1829 [arthropod]
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Subph. Chelicerata Heymons 1901
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Unr. Euchelicerata Weygoldt and Paulus 1979
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Or. †Chasmataspidida Caster and Brooks 1956
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G. †Achanarraspis Anderson et al. 2000
Fm. †Chasmataspididae Caster and Brooks 1956
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G. †Chasmataspis Caster and Brooks 1956
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†Chasmataspis laurencii Caster and Brooks 1956
Fm. †Diploaspididae Stormer 1972
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G. †Diploaspis Størmer 1972
G. †Octoberaspis Dunlop 2002
G. †Forfarella Dunlop et al. 1999