Classification of Manso and Andrade 2008
Cl. Echinoidea Leske 1778 [sea urchin]
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Subor. †Phymosomatoida Mortensen 1904
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Or. Spatangoida Agassiz 1840 [heart urchin]
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Subor. Hemiasterina Fischer 1966
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Fm. Hemiasteridae Clark 1917
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G. †Mecaster Pomel 1883
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†Mecaster batnensis Coquand 1862
†Mecaster fourneli Agassiz and Dessor 1847