Classification of Kier 1968

Or. Clypeasteroida Agassiz 1836 [sand dollar]
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Subor. Laganina Mortensen 1948
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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
G. Fibularia Lamarck
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†Fibularia alabamensis Cooke 1959
G. †Leniechinus Kier 1968
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†Leniechinus herricki Kier 1968
Fm. Neolaganidae Durham 1954
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G. †Durhamella Kier 1968
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†Durhamella floridanum Clark and Twitchell 1915
†Durhamella ocalana Cooke 1942
G. †Pentedium
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†Pentedium curator Kier 1967
Subor. Scutellina Haeckel 1896
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Fm. †Protoscutellidae Durham 1955
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G. †Periarchus Conrad 1866