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| Kingdom | Animalia
– Animal, animaux, animals |
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| Subkingdom | Bilateria
– triploblasts |
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| Infrakingdom | Protostomia
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| Superphylum | Spiralia
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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 | Orthogastropoda
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| Infraclass | Heterobranchia
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| Superorder | Hygrophila
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| Order | Lymnaeida
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| Superfamily | Planorboidea Rafinesque, 1815
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| Family | Physidae Fitzinger, 1833
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| Genus | Physella Haldeman, 1842 |
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Direct Children: |
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| Species |
Physella acuta (Draparnaud, 1805)
– European physa | |
| Species |
Physella ancillaria (Say, 1825)
– Pumpkin Physa | |
| Species |
Physella bermudezi (Aguayo, 1935)
– Lowdome Physa | |
| Species |
Physella bottimeri (Clench, 1924)
– Comanche Physa | |
| Species |
Physella boucardi (Crosse and P. Fischer, 1881)
– Desert Physa | |
| Species |
Physella columbiana (Hemphill, 1890)
– Rotund Physa | |
| Species |
Physella conoidea (P. Fischer and Crosse, 1886)
– Texas Physa | |
| Species |
Physella cooperi (Tryon, 1865)
– Olive Physa | |
| Species |
Physella costata (Newcomb, 1861)
– Ornate Physa | |
| Species |
Physella cubensis (Pfeiffer, 1839)
– Carib Physa | |
| Species |
Physella globosa (Haldeman, 1841)
– Globose Physa | |
| Species |
Physella gyrina (Say, 1821)
– Tadpole Physa | |
| Species |
Physella hemphilli Taylor, 2003
– Idaho Physa | |
| Species |
Physella hendersoni (Clench, 1925)
– Bayou Physa | |
| Species |
Physella heterostropha (Say, 1817)
– Pewter Physa | |
| Species |
Physella hordacea (Lea, 1864)
– Grain Physa | |
| Species |
Physella humerosa (Gould, 1855)
– Corkscrew Physa | |
| Species |
Physella integra (Haldeman, 1841)
– Ashy Physa | |
| Species |
Physella johnsoni (Clench, 1926)
– Banff Springs Physa | |
| Species |
Physella lordi (Baird, 1863)
– Twisted Physa | |
| Species |
Physella magnalacustris (Walker, 1901)
– Great Lakes Physa | |
| Species |
Physella mexicana (Philippi, 1841)
– Polished Physa | |
| Species |
Physella microstriata (Chamberlin and E. G. Berry, 1930)
– Fish Lake Physa | |
| Species |
Physella osculans (Haldeman, 1841)
– Cayuse Physa | |
| Species |
Physella parkeri (Currier, 1881)
– Broadshoulder Physa | |
| Species |
Physella pomilia (Conrad, 1834)
– Claiborne Physa | |
| Species |
Physella propinqua (Tryon, 1865)
– Rocky Mountain Physa | |
| Species |
Physella spelunca (Turner and Clench, 1974)
– Cave Physa | |
| Species |
Physella squalida (Morelet, 1851)
– Squalid Physa | |
| Species |
Physella traski (Lea, 1864)
– Sculpted Physa | |
| Species |
Physella utahensis (Clench, 1925)
– Utah Physa | |
| Species |
Physella vinosa (Gould, 1848)
– Banded Physa | |
| Species |
Physella virgata (Gould, 1855)
– Protean Physa | |
| Species |
Physella virginea (Gould, 1847)
– Sunset Physa | |
| Species |
Physella winnipegensis Pip, 2004
– Lake Winnipeg Physa | |
| Species |
Physella wrighti Te and Clarke, 1985
– Hotwater Physa | |
| Species |
Physella zionis (Pilsbry, 1926)
– Wet-rock Physa | |
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