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 | Chordata
– cordés, cordado, chordates |
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| Subphylum | Vertebrata
– vertebrado, vertébrés, vertebrates |
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| Infraphylum | Agnatha
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| Class | Myxini
– hagfishes |
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| Order | Myxiniformes
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| Family | Myxinidae
– brujas, myxines, hagfishes |
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| Subfamily | Quadratinae Wisner, 1999
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| Genus | Quadratus Wisner, 1999 |
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Direct Children: |
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| Species | Quadratus ancon Mok, Saavedra-Diaz and Acero P., 2001
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| Species | Quadratus nelsoni (Kuo, Huang and Mok, 1994)
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| Species | Quadratus taiwanae (Shen and Tao, 1975)
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| Species | Quadratus yangi (Teng, 1958)
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