Classification of Moore 1976

Fm. Turritellidae Lovén 1847 [turret shell]
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G. Turritella Lamarck 1799 [turret shell]
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Fm. Acteonidae d'Orbigny 1835
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G. Acteon Montfort 1810
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†Acteon chehalisensis Weaver 1916
Fm. Architectonicidae Gray 1850
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G. Architectonica Röding 1798 [sundial]
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†Architectonica blanda Dall 1909
Fm. Buccinidae Rafinesque 1815 [true whelk]
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G. †Molopophorus Gabb 1869
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†Molopophorus gabbi Dall 1909
Fm. Calyptraeidae Lamarck 1809 [slipper shell]
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G. Crepidula Lamarck 1799
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†Crepidula pileum Gabb 1864
Invalid names: Spirocrypta Gabb 1864 [synonym]
Fm. Cardiidae Lamarck 1809 [cockle]
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Subfm. Protocardiinae Reuss 1846
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G. Nemocardium Meek 1876
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Subg. Nemocardium (Keenaea) Habe 1951
Fm. Carditidae Fleming 1820
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Subfm. Carditamerinae Chavan 1969
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G. Cyclocardia Conrad 1867
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Subg. Cyclocardia (Cyclocardia) Conrad 1867
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Fm. Dentaliidae Gray 1834
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G. Dentalium Linnaeus 1758
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Subg. Dentalium (Fissidentalium) Fischer 1885
Subg. †Dentalium (Fissidentalium) Fischer 1885
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Fm. Epitoniidae Berry 1910 [wentletrap]
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G. Opalia Adams and Adams 1853
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Subg. Opalia (Dentiscala) de Boury 1886
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Fm. Fasciolariidae Gray 1853
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G. †Perse Clark 1918
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†Perse pittsburgensis Durham 1944
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†Perse washingtoniana Weaver 1912
Invalid names: Whitneyella Stewart 1927 [synonym]
Fm. Hiatellidae Gray 1824
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G. Panopea Menard 1807
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†Panopea ramonensis Clark 1925
†Panopea snohomishensis Clark 1925
Fm. Lucinidae Fleming 1828
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Subfm. Myrteinae Chavan 1969
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G. Lucinoma Dall 1901
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†Lucinoma columbiana Clark and Arnold 1923
Fm. Mactridae Lamarck 1809
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G. Spisula Gray 1837
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Subg. Spisula (Mactromeris) Conrad 1868
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†Spisula eugenensis Clark 1925
Fm. Mesodesmatidae Gray 1840
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Subfm. Davilinae Dall 1895
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G. Ervillia Turton 1822
Fm. Mytilidae Rafinesque 1815 [mussel]
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Subfm. Crenellinae Gray 1840
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G. Crenella Brown 1827
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†Crenella porterensis Weaver 1916
G. Mytilus Linnaeus 1758
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†Mytilus snohomishensis Weaver 1912
Fm. Naticidae Guilding 1834 [moon snail]
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Subfm. Naticinae Guilding 1834
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G. Cryptonatica Dall 1892
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Subfm. Polinicinae Gray 1847
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G. Neverita Risso 1826
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Subg. Neverita (Glossaulax) Pilsbry 1929
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G. Polinices Monfort 1810 [moon snail]
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Subfm. †Sininae Woodring 1928
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G. Sinum Röding 1798
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†Sinum obliquum Gabb 1864
Fm. Nuculanidae Adams and Adams 1858 [pointed nut clam]
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G. †Litorhadia Stewart 1930
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G. Yoldia Möller 1842
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Subg. Yoldia (Kalayoldia) Grant, IV and Gale 1931
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Fm. Nuculidae Gray 1824 [nut clam]
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G. Acila Adams and Adams 1858 [divaricate nutclam]
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Subg. Acila (Truncacila) Grant and Gale 1931
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G. Nucula Lamarck 1799
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Subg. Nucula (Leionucula) Quenstedt 1930
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Fm. Periplomatidae Dall 1895
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G. Cochlodesma Couthouy 1839
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Fm. Pyramidellidae Gray 1840
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G. Odostomia Fleming 1817
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†Odostomia winlockiana Effinger 1938
Fm. Scaphandridae Sars 1878
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G. Scaphander Monfort 1810
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†Scaphander stewarti Durham 1944
Fm. Solenidae Lamarck 1809
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G. Solen Linnaeus 1758
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Subg. †Solen (Eosolen) Stewart 1930
G. Solena Mörch 1853
Fm. Tellinidae Blainville 1814 [tellin clam]
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Subfm. †Tellininae Blainville 1814
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G. Tellina Linnaeus 1758
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Subg. Tellina (Eurytellina) Fischer 1887
Fm. Thraciidae Stoliczka 1870
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G. Thracia Blainville 1824
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Subg. Thracia (Thracia) Blainville 1824
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Fm. Turridae Swainson 1840 [turrid]
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Subfm. Clavinae Casey 1904
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G. Spirotropis Sars 1878
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†Spirotropis kincaidi Weaver 1916
G. Suavodrillia Dall 1918
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†Suavodrillia winlockensis Effinger 1938
Subfm. Turriculinae Blainville 1824
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G. Aforia Dall 1889 [aforia]
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†Aforia campbelli Durham 1944
Subfm. Turrinae Swainson 1840
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G. Taranis Jeffreys 1870
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†Taranis columbiana Anderson and Martin 1914
Fm. Ungulinidae Adams and Adams 1857
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G. Felaniella Dall 1899
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Subg. Felaniella (Felaniella) Dall 1899
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Fm. Veneridae Rafinesque 1815 [venus clam]
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Subfm. Pitarinae Stewart 1930
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G. Callista Poli 1791
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G. Pitar Römer 1857
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Subg. Pitar (Pitar) Römer 1857
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†Pitar (Pitar) dalli Weaver 1916
Fm. Neptuneidae Stimpson 1865
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G. †Bruclarkia Trask 1926
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†Bruclarkia columbiana Anderson and Martin 1914
G. †Eosiphonalia Ruth 1942
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Fm. Nautilidae de Blainville 1825
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G. †Aturia Bronn 1838
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†Aturia angustata Conrad 1849
Fm. Fusinidae Swainson 1840
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G. †Priscofusus Conrad 1865
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†Priscofusus stewarti Tegland 1933
Subg. †Solena (Eosolen) Stewart 1930
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