Classification of Ragaini 1994

Or. Temnopleuroida Mortensen 1942
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Fm. Temnopleuridae Agassiz 1872
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G. †Arbacina Pomel 1869
Or. Spatangoida Agassiz 1840 [heart urchin]
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Fm. Brissidae Gray 1855
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G. Brissopsis Agassiz 1840
Invalid names: Pericosmidae Lambert 1905 [empty]
Fm. Schizasteridae Lambert 1905
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G. Schizaster Agassiz 1835
Fm. Spatangidae Gray 1825
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G. Spatangus Gray 1825
Fm. Cidaridae Gray 1825
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G. †Plegiocidaris Pomel 1883
G. Prionocidaris Agassiz 1863
Fm. Hemiasteridae Clark 1917
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G. Hemiaster Agassiz and Desor 1847 [heart urchin]
Fm. Clypeasteridae Agassiz 1836
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G. Clypeaster Lamarck 1801
Fm. Echinolampadidae Gray 1851
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G. Echinolampas Gray 1825