Classification of Nagao 1928

Cl. Gastropoda Cuvier 1795 [snail]
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Fm. Siphonaliidae Finlay 1928
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G. Siphonalia Adams 1863
G. †Sycum Bayle 1880
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Subg. †Sycum (Bulbifusus) Conrad 1865
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G. Polinices Monfort 1810 [moon snail]
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Subg. Polinices (Lunatia) Gray 1847
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Fm. Turritellidae Lovén 1847 [turret shell]
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G. Turritella Lamarck 1799 [turret shell]
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†Turritella miikensis Nagao 1928
†Turritella okadai Nagao 1928
Fm. Anomiidae Rafinesque 1815
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G. Anomia Linnaeus 1758 [jingle]
Fm. Buccinidae Rafinesque 1815 [true whelk]
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G. Hemifusus Swainson 1840
Fm. Cardiidae Lamarck 1809 [cockle]
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G. Cardium Linnaeus 1758
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†Cardium miikense Nagao 1928
Fm. Carditidae Fleming 1820
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G. Venericardia Lamarck 1801
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†Venericardia mandaica Yokoyama 1911
†Venericardia nipponica Yokoyama 1911
Fm. Corbulidae Lamarck 1818
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G. Corbula Bruguière 1789
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Subg. †Corbula (Cuneocorbula) Cossmann 1886
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†Corbula subtumida Nagao 1928
Fm. Limidae Rafinesque 1815 [file clam]
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G. Lima Bruguière 1797
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†Lima amaxensis Yokoyama 1911
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†Lima eocenica Nagao 1928
Fm. Mytilidae Rafinesque 1815 [mussel]
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G. Mytilus Linnaeus 1758
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†Mytilus rigaultii Deshayes 1884
Fm. Naticidae Guilding 1834 [moon snail]
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G. Polynices Monfort 1810 [moon snail]
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Subg. Polynices (Neverita) Risso 1826
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Fm. Neritidae Rafinesque 1815
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G. Nerita Linnaeus 1758
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†Nerita subgranulosa Nagao 1928
Fm. Nuculidae Gray 1824 [nut clam]
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G. Nucula Lamarck 1799
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Subg. Nucula (Acila) Adams and Adams 1858 [divaricate nutclam]
Fm. Scaphandridae Sars 1878
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G. Cylichna Lovén 1846
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†Cylichna paupercula Nagao 1928
Fm. Solenidae Lamarck 1809
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G. Cultellus Schumacher 1817
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†Cultellus brevis Nagao 1928
Fm. Strombidae Rafinesque 1815 [true conch]
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G. †Orthaulax Gabb 1872
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†Orthaulax japonicus Nagao 1924
Fm. Tellinidae Blainville 1814 [tellin clam]
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G. Macoma Leach 1819
G. Tellina Linnaeus 1758
Fm. Trochidae Rafinesque 1815 [top snail]
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G. †Turcicula Koken 1900
Fm. Unionidae Rafinesque 1820 [freshwater mussel]
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G. Unio Philipsson 1788
Fm. Veneridae Rafinesque 1815 [venus clam]
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G. Macrocallista Meek 1876
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G. Pitaria Roemer 1857
Fm. †Ledidae Adams and Adams 1858
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G. Yoldia Möller 1842
Fm. †Crassatellitidae Dall 1895
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G. Crassatellites Krueger 1823
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†Crassatellites fuscus Yokoyama 1911
Fm. Cyrenidae Gray 1840
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G. †Cyrena Lamarck
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Subg. Cyrena (Batissa) Gray 1853
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Fm. Melaniidae Gray
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G. Melania Lamarck 1800
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†Melania miikensis Nagao 1928
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G. Turris Röding 1798
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†Turris higoensis Nagao 1928
Fm. Diplodontidae Carpenter 1861
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G. Diplodonta Bronn 1831
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Fm. †Rissoinidae Stimpson 1865
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G. Rissoina d'Orbigny 1840
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†Rissoina gemma Nagao 1928
Fm. Melanopsidae Adams and Adams 1854
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G. †Faunus Montfort 1810
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†Faunus nipponicus Nagao 1928
Fm. Cerithiidae Fleming 1822 [cerith snail]
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G. Cerithiopsis Hanley 1849
Fm. Pedalionidae Stephenson 1923
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G. †Pedalion Huddesford 1770
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†Pedalion tomiyasui Nagao 1928
Fm. †Pentacrinidae Gray 1842
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G. †Pentacrinus Miller 1821
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†Pentacrinus ariakensis Yokoyama 1911