Classification of Rivera 1957

Cl. Gastropoda Cuvier 1795 [snail]
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Subcl. Streptoneura Spengel 1881
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Or. Ctenobranchiata Schweigger 1820
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Subor. †Ptenoglossa Gray 1853
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Fm. Epitoniidae Berry 1910 [wentletrap]
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G. Epitonium Bolten 1798
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Subg. Epitonium (Acrilla) Adams and Adams 1860
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Subor. †Rachiglossa Gray 1853
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Superfm. Buccinacea Rafinesque 1815
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Fm. Buccinidae Rafinesque 1815 [true whelk]
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Subfm. Pseudolivinae Cossmann 1901
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G. Dorsanum Gray 1847
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†Dorsanum lagunitensis Woods 1922
G. Melongena Schumacher 1817
G. Pseudoliva Swainson 1840
G. Siphonalia Adams 1863
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†Siphonalia acuta Rivera 1957
†Siphonalia trilica Rivera 1957
Fm. Fasciolaridae Gray 1853
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G. †Peruficus
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†Peruficus lagunitensis Olsson 1929
Fm. Xancidae Pilsbry 1922
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G. Xancus Röding 1798
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†Xancus talarensis Olsson 1930
Superfm. Volutacea Rafinesque 1815
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Fm. Volutidae Rafinesque 1815 [volute]
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G. Voluta Linnaeaus 1758
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Subg. †Voluta (Peruluta) Olsson 1928
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Superfm. Cerithiacea Férussac 1819
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Fm. Architectonicidae Gray 1850
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G. Architectonica Röding 1798 [sundial]
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Fm. Cerithiopsidae Adams and Adams 1853
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G. Cerithiopsis Hanley 1849
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Fm. Melanidae Gray
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G. †Anconia Olsson 1931
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†Anconia elenensis Olsson 1931
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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 woodsi Lisson 1925
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Invalid names: Turritella portaroi Lisson 1925 [synonym]
Invalid names: Naticacea Forbes 1838 [empty]
Subor. Toxoglossa Troschel 1848
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Fm. Cancellariidae Gray 1853
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G. Admete Müller 1842 [admete]
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Subg. †Admete (Bonellitia) Jousseaume 1887
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Fm. Turridae Swainson 1840 [turrid]
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G. †Andicula
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†Andicula occidentalis Woods 1922
†Andicula olssoni Rivera 1957
G. †Eopleurotoma Cossmann 1889
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†Eopleurotoma paracasina Rivera 1957
G. †Ampullina Férussac 1822
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†Ampullina paracasina Rivera 1957
Cl. †Pelecypoda Goldfuss 1820
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Or. †Prionodesmacea Dall 1889
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Invalid names: Schizodonta [empty], Taxodonta [empty]
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Invalid names: Asthenodonta [empty], Diagenodonta [empty], Teleodonta [empty]
Fm. †Dosiniidae
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G. Dosinia Scopoli 1777
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†Dosinia coloradoensis Rivera 1957
†Dosinia lechuzaensis Rivera 1957