Taxonomic Hierarchy
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| Kingdom | Animalia
– Animal, animaux, animals |
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| Subkingdom | Bilateria
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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 | Gnathostomata
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| Superclass | Chondrichthyes
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| Class | Chondrichthyes
– cartilaginous fishes, rays, sharks, condrictes, peixe cartilaginoso, tubarăo, poissons cartilagineux, raies, requins |
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| Subclass | Elasmobranchii
– cartilaginous fishes, rays, sharks, skates, torpedoes |
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| Superorder | Euselachii
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| Order | Hexanchiformes Compagno, 1973 – cow sharks, frilled sharks |
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Direct Children: |
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| Family |
Chlamydoselachidae Garman, 1884
– frilled sharks, frill sharks, requins-lézards, tiburones anguila | |
| Family |
Hexanchidae Gray, 1851
– cow sharks, sevengill sharks, sixgill sharks, grisets, tiburones cańabota | |
| Family |
Notorynchidae Compagno, 1999
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