Classification of the family Echinothuriidae

Fm. Echinothuriidae Thomson 1872
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Subfm. Echinothuriinae Thomson 1872
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Subfm. Hygrosomatinae Smith and Wright 1990
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G. Hygrosoma Hygrosoma 1903
Subfm. Sperosomatinae Smith and Wright 1990
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G. Sperosoma Koehler 1897