Kingdom Animalia Linnaeus, 1758 - animals
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   Phylum Echinodermata Bruguière, 1789 - echinoderms
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     Subphylum Eleutherozoa Bell, 1891
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       Class Echinoidea (Leske, 1778) - sea urchins and sand dollars
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         Subclass Perischoechinoidea (M'Coy, 1849)
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           Genus Cidaris Leske, 1778
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