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 Asteroidea Blainville, 1830 - sea stars
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         Order Paxillosida Perrier, 1884
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           Genus Astropecten Schultze, 1760
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           Genus Ctenodiscus Müller & Troschel, 1842 - mud star
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