Classification of Ragaini 1994
Or. Temnopleuroida Mortensen 1942
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Or. Spatangoida Agassiz 1840 [heart urchin]
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Invalid names: Pericosmidae Lambert 1905 [empty]
Fm. Cidaridae Gray 1825
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G. †Plegiocidaris Pomel 1883
G. Prionocidaris Agassiz 1863