Classification of Linder et al. 1988
Cl. Echinoidea Leske 1778 [sea urchin]
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Or. Arbacioida Gregory 1900
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Subor. †Phymosomatoida Mortensen 1904
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Fm. †Phymosomatidae Pomel 1883
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Fm. Stomechinidae Pomel 1883
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G. †Stomechinus Desor 1858
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†Stomechinus bigranularis Lamarck 1816
†Stomechinus dissimilaris Linder et al. 1988
Or. Temnopleuroida Mortensen 1942
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G. †Gagaria Duncan 1889
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†Gagaria crenularis Linder et al. 1988
†Gagaria venustula Duncan and Sladen 1884
Fm. Toxopneustidae Troschel 1872
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G. Lytechinus Agassiz 1863
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†Lytechinus baldwini Linder et al. 1988
Lytechinus variegatus Lamarck 1816