Classification of the order Echinothurideae

Or. Echinothurioida Claus 1880
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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
Fm. Kamptosomatidae Mortensen 1934
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G. Kamptosoma Mortensen 1903
Fm. †Pelanechinidae Groom 1887
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†Pelanechinus corallinus Wright 1858
Invalid names: Pelanodiadema [synonym]
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†Pseudopedina bakeri Wright 1854
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Invalid names: Soudetaster martinezae Vadet et al. 2011 [synonym]
†Pseudopedina divionensis Michelin 1854
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Invalid names: Echinopsis smithii Forbes 1856 [synonym], Pseudopedina nodoti Cotteau 1858 [synonym]
Invalid names: Soudetaster Vadet et al. 2011 [synonym]
Invalid names: Pelanodiademidae Hess 1972 [invalid subgroup]
Fm. Phormosomatidae Mortensen 1934
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Invalid names: Paraphormosomatinae Smith and Wright 1990 [empty]