Classification of Kier 1980
G. †Periarchus Conrad 1866
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G. †Linthia Desor 1853
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†Linthia hanoverensis Kellum 1926
†Linthia wilmingtonensis Clark and Twitchell 1915
Fm. Spatangidae Gray 1825
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Fm. Cidaridae Gray 1825
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Unr. Cidarinae Gray 1825
Subfm. Rhabdocidarinae Lambert 1900
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G. Phyllacanthus Brandt
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†Phyllacanthus carolinensis Emmonds 1858
†Phyllacanthus mitchelli Emmonds 1858
Fm. Arbaciidae Gray 1855
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Fm. Echinolampadidae Gray 1851
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Fm. Fibulariidae Gray 1855
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G. Echinocyamus van Phelsum 1774
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†Echinocyamus bisexus Kier 1968
Echinocyamus parvus Emmonds 1858
Fm. Brissidae Gray 1855
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G. Eupatagus Agassiz 1847
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†Eupatagus carolinensis Clark and Twitchell 1915
†Eupatagus lawsonae Kier 1980
†Eupatagus wilsoni Kier 1980
Fm. Cassidulidae Agassiz and Desor 1847
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Fm. †Pliolampadidae Kier 1962
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G. †Eurhodia
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†Eurhodia baumi Kier 1980
†Eurhodia holmsei Clark and Twitchell 1915
†Eurhodia rugosa Ravenel 1848
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†Eurhodia rugosa depressa Kier 1980
†Eurhodia rugosa ideali Kier 1980
G. †Santeelampas
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†Santeelampas oviformis Clark and Twitchell 1915
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Invalid names: Breynella gregoryi Clark and Twitchell 1915 [synonym]
Fm. †Protoscutellidae Durham 1955
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G. †Protoscutella Stefanini 1924
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†Protoscutella conradi Cotteau 1891
†Protoscutella mississippiensis Clark and Twitchell 1915
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†Protoscutella mississippiensis rosehillensis Kier 1980
†Protoscutella plana Conrad 1865
Fm. †Unifasciidae Cooke 1959
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†Eurhodia rugosa rugosa Ravenel 1848
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Invalid names: Cassidulus (Rhynchopygus) ravenli Clark and Twitchell 1915 [synonym]