Classification of Geys and Jagt 1986
Subor. †Phymosomatoida Mortensen 1904
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Fm. †Phymosomatidae Pomel 1883
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G. †Rachiosoma Pomel 1883
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†Rachiosoma corollare Leske 1778
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Invalid names: Cidarites granulosum Goldfuss 1826 [synonym], Echinites saxatilis Parkinson 1811 [synonym]
Or. †Orthopsida Mortensen 1942
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Fm. †Orthopsidae Duncan 1889
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G. †Orthopsis Cotteau 1864
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†Orthopsis miliaris d'Archiac 1835
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Invalid names: Diadema granulare Agassiz 1846 [synonym], Diadema kleinii Desmoulins 1837 [synonym], Diadema polystigma Agassiz 1840 [synonym]