Classification of Neuman and Bruton 1974

Cl. †Articulata Huxley 1869
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Or. †Orthida Schuchert and Cooper 1932
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Subor. †Orthidina Schuchert and Cooper 1932
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Superfm. †Orthacea Woodward and Schuchert 1852
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Fm. †Finkelnburgiidae Schuchert and Cooper 1931
Fm. †Orthidae Woodward 1852
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Subfm. †Orthinae Woodward 1852
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G. †Trondorthis Neuman 1974
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†Trondorthis bifurcatus Cooper 1956
†Trondorthis strandi Neuman and Bruton 1974
Or. †Strophomenida Opik 1934
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Invalid names: Strophomenidina Opik 1934 [empty]
Fm. †Asaphidae Burmeister 1843
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Subfm. †Isotelinae Angelin 1854
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G. †Isoteloides Raymond 1910
Subfm. †Niobinae Jaanusson 1959
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G. †Niobe Angelin 1851
Fm. †Cheiruridae Hawle and Corda 1847
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Subfm. †Deiphoninae Raymond 1913
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G. †Sphaerocoryphe Angelin 1854
Fm. †Dalmanitidae Vogdes 1890
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G. †Calyptaulax Cooper 1930
Fm. †Bathyuridae Walcott 1886
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G. †Goniotelina Whittington and Ross 1953
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†Goniotelina williamsi Ross 1951