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 Euechinoidea Bronn, 1860
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           Superorder Gnathostomata Zittel, 1879
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             Order Holectypoida Ducan, 1889
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               Genus Echinoneus van Phelsum, 1774
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