Classification of Clark 1904
Ph. Echinodermata Klein 1754
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Cl. Echinoidea Leske 1778 [sea urchin]
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Or. Clypeasteroida Agassiz 1836 [sand dollar]
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Or. Spatangoidea Agassiz 1840 [heart urchin]
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Cl. Ophiuroidea Gray 1840 [brittle star]
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