Taxonomic Hierarchy
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| | Kingdom | Animalia
– Animal, animaux, animals |
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| | Subkingdom | Bilateria
– triploblasts |
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| | Infrakingdom | Deuterostomia
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| | Phylum | Echinodermata Bruguière, 1791 [ex Klein, 1734]
– echinoderms, échinodermes, bolacha da praia, equinoderma, equinodermata, estrela do mar, ouriço do mar |
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| | Subphylum | Echinozoa Haeckel, 1895
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| | Class | Echinoidea Leske, 1778
– heart urchins, sand dollars, sea urchins, châtaignes de mer, clypéastres, oursins, bolacha da praia, equinóide, ouriço do mar, heart urchins, sand dollars, sea urchins, urchins |
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| | Subclass | Euechinoidea Bronn, 1860
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| | Superorder | Diadematacea Duncan, 1889
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| | Order | Diadematoida Duncan, 1889 |
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Direct Children: |
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| | Family |
Aspidodiadematidae Duncan, 1889
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| | Family |
Diadematidae Gray, 1855
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| | Family |
Lissodiadematidae
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| | Family |
Micropygidae
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