Classification of Spencer 1951

Ph. Echinodermata Klein 1754
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Subcl. †Somasteroidea Spencer 1951
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Fm. †Archegonasteridae Spencer 1951
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G. †Archegonaster Jaekel 1923
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Archegonaster pentagonus Spencer 1951
Or. †Goniactinida Spencer 1951
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Fm. †Chinianasteridae Spencer 1951
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G. †Chinianaster Thoral 1935
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Chinianaster levyi Thoral 1935
G. †Villebrunaster Spencer 1951
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Villebrunaster thorali Spencer 1951
Cl. Asteroidea de Blainville 1830 [sea star]
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Or. †Hemizonida Spencer 1951
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Subor. †Gnathasterina Spencer 1951
Subor. †Urasterina Spencer 1951
Or. Phanerozonida Sladen 1889
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Subor. †Pustulosa Spencer 1951
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Fm. †Petrasteridae Spencer 1951
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G. †Petraster Billings 1858
Or. †Platyasterida Spencer 1951
Or. †Stenurida Spencer 1951
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Superfm. †Eophiuricae Spencer 1951
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Fm. †Eophiuridae Schöndorf 1910
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G. †Eophiura Jaekel 1903
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Eophiura bohemica Schuchert 1915
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Invalid names: Eophiura petaloides Jaekel 1923 [synonym]
G. †Ptilonaster Hall 1868
G. †Rhopalocoma Salter 1857
Fm. †Phragmactidae Spencer 1951
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G. †Bdellacoma Salter 1857
G. †Phragmactis Spencer 1940
Fm. †Pradesuridae Spencer 1951
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G. †Pradesura Spencer 1951
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Pradesura jacobi Thoral 1935
G. †Stuertzaster Etheridge 1899
Fm. †Stenasteridae Schuchert 1914
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G. †Stenaster Billings 1858
Superfm. †Palaeuricae Spencer 1951
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Fm. †Palaeuridae Spencer 1951
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G. †Palaeura Jaekel 1903
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Palaeura neglecta Schuchert 1915