Taxonomic Hierarchy
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| Kingdom | Animalia
– Animal, animaux, animals |
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| Phylum | Cnidaria Hatschek, 1888
– cnidarians, coelenterates, cnidaires, coelentérés, água viva, anêmona, caravela, cnidario, coral, hidra |
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| Subphylum | Medusozoa
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| Class | Hydrozoa Owen, 1843
– hydralike animals, hydroids, hydrozoans, hydraires, hydrozoaires, água viva, hidra, hidrozoa, hidrozoário, pólipo |
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| Subclass | Hydroidolina
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| Order | Leptothecatae
– thecate hydroids, hydromedusae |
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| Family | Laodiceidae
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| Genus | Ptychogena A. Agassiz, 1865 |
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Direct Children: |
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| Species | Ptychogena antarctica Browne, 1907
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| Species | Ptychogena aurea Vanhöffen, 1912
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| Species | Ptychogena californica Torrey, 1909
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| Species | Ptychogena crocea Kramp and Damas, 1925
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| Species | Ptychogena hyperborea Kramp, 1942
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| Species | Ptychogena lactea A. Agassiz, 1865
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| Species | Ptychogena longigona Maas, 1893
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