Classification of Cooke 1959
G. †Tylocidaris Pomel 1883
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†Tylocidaris salina Cooke 1959
†Tylocidaris walcotti Clark 1891
G. Salenia Gray 1835
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G. Clypeaster Lamarck 1801
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†Clypeaster cotteaui Egozcue 1897
†Clypeaster oxybaphon Jackson 1922
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Invalid names: Clypeaster pinarensis Lambert and Sanchez-Roig 1949 [synonym], Clypeaster platygaster Jackson 1922 [synonym], Clypeaster polygonalis Sanchez-Roig 1949 [synonym], Clypeaster profundus Sanchez-Roig 1949 [synonym]
†Clypeaster rogersi Morton 1834
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Invalid names: Clypeaster douvillei Stefanini 1911 [synonym], Clypeaster marinanus Jackson 1937 [synonym], Scutella jonesi Forbes 1845 [synonym]
G. †Protoscutella Stefanini 1924
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†Protoscutella mississippiensis Clark and Twitchell 1915
G. Cassidulus Lamarck 1801
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†Cassidulus gouldii Bouve 1846
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Invalid names: Cassidulus (Cassidulus) alabamensis Clark and Twitchell 1915 [synonym]
G. Hemiaster Agassiz and Desor 1847 [heart urchin]
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†Hemiaster moscovensis Cooke 1959
†Hemiaster parastatus Morton 1833
Fm. Schizasteridae Lambert 1905
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G. Agassizia Valenciennes 1846
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G. †Linthia Desor 1853
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†Linthia alabamensis Clark and Twitchell 1915
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Invalid names: Linthia maverickensis Gardner 1935 [synonym]
†Linthia prima Cooke 1942
Fm. Echinidae Gray 1825
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Fm. Cidaridae Gray 1825
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Fm. †Phymosomatidae Pomel 1883
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Fm. Arbaciidae Gray 1855
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Fm. Echinoneidae Agassiz and Desor 1847
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Fm. Brissidae Gray 1855
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G. Eupatagus Agassiz 1847
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Subg. †Eupatagus (Brissopatagus) Cotteau 1863
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†Eupatagus (Brissopatagus) alabamensis Cooke 1942
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Invalid names: Eupatagus (Brissopatagus) georgianus Cooke 1942 [synonym]
Fm. †Orthopsidae Duncan 1889
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Fm. Cassidulidae Agassiz and Desor 1847
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G. †Echanthus Cooke 1942
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†Echanthus georgiensis Clark and Twitchell 1915
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Invalid names: Cassidulus (Galerolampas) fontis Cooke 1942 [synonym]