Classification of Donovan 1993

Cl. Echinoidea Leske 1778 [sea urchin]
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Or. Arbacioida Gregory 1900
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Fm. Arbaciidae Gray 1855
G. †Goniopygus Agassiz 1838
Or. Calycina Gregory 1900
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Fm. †Acrosaleniidae Gregory 1900
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G. †Heterosalenia Cotteau
Or. Cassiduloida Agassiz and Desor 1847
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Fm. †Nucleolitidae Agassiz and Desor 1847
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G. †Pygopistes Pomel
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†Pygopistes rudistarum Hawkins 1923
Or. Cidaroida Claus 1880 [pencil urchin]
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Fm. Cidaridae Gray 1825
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Unr. Cidarinae Gray 1825
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G. Phyllacanthus Brandt
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†Phyllacanthus leoni Lambert and Sanchez Roig 1926
G. Temnocidaris Cotteau 1863
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Or. Holectypoida Duncan 1889
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Fm. †Holectypidae Lambert 1900
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G. †Metholectypus Hawkins 1923
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†Metholectypus trechmanni Hawkins 1923
Or. Spatangoida Agassiz 1840 [heart urchin]
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Fm. Hemiasteroidae Clark 1917
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G. Hemiaster Agassiz and Desor 1847 [heart urchin]
Or. Temnopleuroida Mortensen 1942
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Fm. Toxopneustidae Troschel 1872
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G. †Scholiechinus Arnold and Clark 1927
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†Scholiechinus axiologus Arnold and Clark 1927