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| Kingdom | Animalia
– Animal, animaux, animals |
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| Subkingdom | Bilateria
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| Infrakingdom | Protostomia
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| Superphylum | Lophozoa
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| Phylum | Mollusca
– mollusques, molusco, molluscs, mollusks |
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| Class | Gastropoda Cuvier, 1797
– gastropods, slugs, snails, escargots, gastéropodes, limaces, caracol, caramujo, lesma |
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| Subclass | Opisthobranchia Milne-Edwards, 1848
– opisthobranchs |
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| Order | Cephalaspidea P. Fischer, 1883
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| Family | Cylichnidae A. Adams, 1850
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| Genus | Cylichna Loven, 1846 |
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Direct Children: |
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| Species | Cylichna alba (T. Brown, 1827)
– white chalice-bubble | |
| Species | Cylichna attanosa
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| Species | Cylichna attonsa Carpenter, 1865
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| Species | Cylichna consobrina
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| Species | Cylichna crebripunctata (Jeffreys, 1881)
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| Species | Cylichna cylindracea (Pennant, 1777)
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| Species | Cylichna diegensis (Dall, 1919)
– San Diego chalice-bubble | |
| Species | Cylichna discus Watson, 1886
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| Species | Cylichna eburnea A. E. Verrill, 1885
– ivory chalice-bubble | |
| Species | Cylichna fantasma (Baker and Hanna, 1927)
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| Species | Cylichna gouldii (Couthouy, 1839)
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| Species | Cylichna linearis Jeffreys, 1867
– lined chalice-bubble | |
| Species | Cylichna nucleolus (Reeve, 1855)
– kernel chalice-bubble | |
| Species | Cylichna obscura Sykes, 1903
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| Species | Cylichna occulta (Mighels and C. B. Adams, 1842)
– concealed chalice-bubble | |
| Species | Cylichna oryza
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| Species | Cylichna ovata Jeffreys, 1871
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| Species | Cylichna verrilli Dall, 1889
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| Species | Cylichna vortex (Dall, 1881)
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Genus | Cylichna Loven, 1846 incertae sedis |
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Children with Uncertain Position: |
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| Species | Diaphana lottae Bush, 1893
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