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| Clypeaster species (120 mm) Turkey, Miocene | Hemipneustus striataradiatus (93 mm) The Netherlands, Cretaceous | Pericosmus gigas (210 mm) Australia, Miocene |
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| Leodia sexiesperforata (105 mm) North Carolina, Pliocene | Dendraster gibbsii (58 mm) California, Pliocene |
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