Classification of Addicott 1970
Cl. Gastropoda Cuvier 1795 [snail]
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Or. Archaeogastropoda Thiele 1925
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Fm. Trochidae Rafinesque 1815 [top snail]
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G. Calliostoma Swainson 1840
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†Calliostoma carsoni Addicott 1970
†Calliostoma diabloensis Clark 1915
G. Tegula Lesson 1835
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Subg. Tegula (Omphalius) Philippi 1847
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†Tegula (Omphalius) dalli Arnold 1907
Tegula (Omphalius) laevis Addicott 1970
Fm. Turbinidae Rafinesque 1815
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G. Astraea Röding 1798
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Subg. Astraea (Pomaulax) Gray 1850
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Astraea (Pomaulax) biangulata Gabb 1866
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Invalid names: Astraea morani Loel and Corey 1932 [synonym], Astralium raymondi Clark 1915 [synonym], Calliostoma bicarinatum Clark 1915 [synonym], Calliostoma obliquistriata Trask 1922 [synonym]
Or. Mesogastropoda Thiele 1925
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Fm. Calyptraeidae Lamarck 1809 [slipper shell]
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G. Calyptraea Lamarck 1799
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Subg. Calyptraea (Trochita) Schumacher 1817
†Calyptraea coreyi Addicott 1970
†Calyptraea filosa Gabb 1866
G. Crucibulum Schumacher 1817
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Fm. Cerithiidae Fleming 1822 [cerith snail]
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G. Bittium Gray 1847
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†Bittium topangensis Arnold 1907
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Invalid names: Bittium trampasensis Clark 1915 [synonym], Cerithiopsis turneri Clark 1915 [synonym], Cerithium arnoldi Anderson and Martin 1914 [synonym]
Fm. Epitoniidae Berry 1910 [wentletrap]
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G. Epitonium Bolten 1798
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Subg. Epitonium (Cirsotrema) Mörch 1852
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†Epitonium (Cirsotrema) clallamense Durham 1937
†Epitonium (Cirsotrema) pasoense Anderson and Martin 1914
G. Opalia Adams and Adams 1853
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Subg. †Opalia (Rugatiscala) de Boury 1913
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†Opalia (Rugatiscala) williamsoni Anderson and Martin 1914
Fm. Eulimidae Philippi 1853
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G. Balcis Leach 1847
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†Balcis conchita Keen 1943
†Balcis lutzi Addicott 1970
†Balcis petrolia Addicott 1970
Fm. Ficidae Meek 1864 [fig shell]
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G. Ficus Röding 1798
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Subg. †Ficus (Trophosycon) Cooper 1894
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†Ficus (Trophosycon) kerniana Cooper 1894
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Invalid names: Agasoma stanfordensis Arnold 1908 [synonym], Ficus nodiferus Gabb 1869 [synonym]
Fm. Naticidae Guilding 1834 [moon snail]
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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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Neverita (Glossaulax) alta Arnold 1903
†Neverita (Glossaulax) andersoni Clark 1918
†Neverita (Glossaulax) jamesae Moore 1963
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 scopulosum Conrad 1849
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Invalid names: Sinum californicum Oldroyd 1917 [synonym], Sinum planicostum Gabb 1869 [synonym]
Fm. Trichotropididae Gray 1850
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Fm. Turritellidae Lovén 1847 [turret shell]
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G. Turritella Lamarck 1799 [turret shell]
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Subg. Turritella (Torcula) Gray 1847
†Turritella kernensis Addicott 1970
†Turritella moodyi Applin 1920
†Turritella ocoyana Conrad 1855
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†Turritella ocoyana topangensis Merriam 1941
Invalid names: Turritella bosei Hertlein and Jordan 1927 [synonym], Turritella wittichi Hertlein and Jordan 1927 [synonym]
Invalid names: Crepidulidae [empty]
Or. Neogastropoda Thiele 1929
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Fm. Buccinidae Rafinesque 1815 [true whelk]
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G. Antillophos Woodring 1928
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†Antillophos posunculensis Anderson and Martin 1914
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Invalid names: Pleurotoma (Clathurella) dumblei Anderson 1905 [synonym]
†Antillophos woodringi Addicott 1970
G. Triumphis Gray 1857
Fm. Cancellariidae Gray 1853
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G. Cancellaria Lamarck 1799
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Subg. †Cancellaria (Coptostoma) Cossmann 1899
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†Cancellaria (Coptostoma) posunculensis Anderson and Martin 1914
Subg. Cancellaria (Euclia) Adams and Adams 1854
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†Cancellaria (Euclia) circumspinosa Addicott 1970
†Cancellaria (Euclia) condoni Anderson 1905
†Cancellaria (Euclia) dalliana Anderson 1905
†Cancellaria (Euclia) joaquinensis Anderson 1905
†Cancellaria (Euclia) nevadensis Anderson and Martin 1914
†Cancellaria (Euclia) ocoyana Addicott 1970
†Cancellaria (Euclia) oregonensis Conrad 1865
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Invalid names: Cancellaria andersoni Clark 1918 [synonym], Cancellaria ramonensis Clark 1918 [synonym]
†Cancellaria (Euclia) pacifica Anderson 1905
†Cancellaria (Euclia) simplex Anderson 1905
†Cancellaria dalli Anderson and Martin 1914
†Cancellaria galei Addicott 1970
†Cancellaria keenae Addicott 1970
Fm. Columbellidae Swainson 1840
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G. Anachis Adams and Adams 1853
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G. Strombina Mörch 1852
Fm. Muricidae Rafinesque 1815 [murex snail]
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G. Ceratostoma Hermannsen 1846
G. Ocenebra Leach in Gray 1847
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†Ocenebra clarki Addicott 1970
†Ocenebra gabbiana Anderson 1905
†Ocenebra milicentana Loel and Corey 1932
†Ocenebra topangensis Arnold 1907
†Ocenebra trophonoides Anderson and Martin 1914
†Ocenebra wilkesana Anderson 1905
G. Trophon Montfort 1810
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Subg. Trophon (Austrotrophon) Dall 1902
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†Trophon (Austrotrophon) kernensis Anderson 1905
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Invalid names: Trophon oregonensis Anderson and Martin 1914 [synonym]
G. Typhis Montfort 1810
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Fm. Nassariidae Iredale 1916
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G. Nassarius Duméril 1806
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Subg. Nassarius (Phrontis) Adams and Adams 1853
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†Nassarius (Phrontis) harrellensis Addicott 1970
†Nassarius (Phrontis) ocoyanus Anderson and Martin 1914
†Nassarius (Phrontis) posoensis Addicott 1970
†Nassarius (Phrontis) smooti Addicott 1965
Fm. Neptuneidae Stimpson 1865
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G. †Bruclarkia Trask 1926
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†Bruclarkia oregonensis Conrad 1848
†Bruclarkia yaquinana Anderson and Martin 1914
G. Kelletia Fischer 1884
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†Kelletia lorata Addicott 1970
†Kelletia posoensis Anderson and Martin 1914
Fm. Olividae Latreille 1825 [olive snail]
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G. Olivella Swainson 1831
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Fm. Thaisidae Dall
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G. Thais Röding 1798
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Subg. Thais (Nucella)
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†Thais (Nucella) packi Clark 1918
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Invalid names: Thais (Stramonita) carrizoensis Loel and Corey 1932 [synonym]
Subg. Thais (Thaisella) Clench 1947
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†Thais (Thaisella) blakei Anderson and Martin 1914
†Thais (Thaisella) edmondi Arnold 1907
Fm. Turridae Swainson 1840 [turrid]
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Subfm. Clavinae Casey 1904
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G. Ophiodermella Bartsch 1944
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†Ophiodermella electilis Keen 1943
†Ophiodermella temblorensis Anderson and Martin 1914
Subfm. Mangeliinae Fischer 1884
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G. Mangelia Loven 1846
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Mangelia (Notocytharella) hartensis Addicott 1970
†Mangelia (Notocytharella) kernensis Anderson and Martin 1914
Subfm. Turriculinae Blainville 1824
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G. Megasurcula Casey 1904
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†Megasurcula condonana Anderson and Martin 1914
†Megasurcula howei Hanna and Hertlein 1938
†Megasurcula keepi Arnold 1907
†Megasurcula wynoocheensis Weaver 1912
G. Turricula Schumacher 1817
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†Turricula bulwaldana Anderson and Martin 1914
†Turricula ochsneri Anderson and Martin 1914
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Invalid names: Drillia wilsoni Anderson and Martin 1914 [synonym], Turricula libya Dall 1919 [synonym]
†Turricula piercei Arnold 1909
Subfm. Turrinae Swainson 1840
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Fm. Volutidae Rafinesque 1815 [volute]
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G. Psephaea Crosse 1871
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Subg. †Psephaea (Miopleiona) Dall 1907
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†Psephaea (Miopleiona) weaveri Tegland 1933
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Invalid names: Miopleiona scowensis Durham 1944 [synonym]
Or. Tectibranchia
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Fm. Acteocinidae
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Fm. Acteonidae d'Orbigny 1835
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G. Bullina Férussac 1822
Fm. †Akeridae Mazzarelli 1891
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Fm. Pyramidellidae Gray 1840
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G. Odostomia Fleming 1817
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Subg. Odostomia (Evalea) Adams 1860
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Odostomia (Evalea) andersoni Bartsch and Hertlein 1917 [Brea owl]
G. Pyramidella Lamarck 1799
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Subg. Pyramidella (Longchaeus) Mörch 1875
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†Pyramidella (Longchaeus) cooperi Anderson and Martin 1914
Subg. Pyramidella (Syrnola) Adams 1860
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†Pyramidella (Syrnola) ochsneri Anderson and Martin 1914
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Invalid names: Syrnola scandix Keen 1943 [synonym]
G. Turbonilla Risso 1826
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Subg. Turbonilla (Ptycheulimella) Sacco 1892
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†Turbonilla (Ptycheulimella) edisonensis Addicott 1970
Subg. Turbonilla (Pyrgiscus) Philippi 1841
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†Turbonilla (Pyrgiscus) bravoensis Keen 1943
†Turbonilla (Pyrgiscus) hormigacuesta Addicott 1970
Subg. Turbonilla (Pyrgolampros) Sacco 1892