Classification of Olsson 1931
Cl. Gastropoda Cuvier 1795 [snail]
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Or. Ctenobranchiata Schweigger 1820
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Superfm. Taenioglossa
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Fm. Cassididae Adams and Adams 1853
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G. Morum Röding 1798
G. †Oniscidea Morch
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†Oniscidea chiraense Olsson 1931
†Oniscidea dolioides Olsson 1931
†Oniscidea peruvianum Olsson 1931
Fm. Cerithiidae Fleming 1822 [cerith snail]
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Fm. Ficidae Meek 1864 [fig shell]
Fm. Melaniidae Gray
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G. †Hannatoma Olsson 1931
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†Hannatoma emendorferi Olsson 1931
†Hannatoma gesteri Hanna and Israelsky 1925
†Hannatoma tumbezia Olsson 1931
Fm. Melanopsidae Adams and Adams 1854
Fm. Naticidae Guilding 1834 [moon snail]
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G. Polinices Monfort 1810 [moon snail]
G. Sinum Röding 1798
Fm. Strombidae Rafinesque 1815 [true conch]
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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 caleta Olsson 1931
†Turritella conquistadorana Hanna and Israelsky 1925
†Turritella galvesia Olsson 1931
†Turritella gilbertharrisi Hodson 1926
†Turritella hubbardi Hodson 1926
†Turritella salchia Olsson 1931
†Turritella samanensis Olsson 1928
Invalid names: Rachigdossa [empty]
G. Saccella Woodring 1925
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†Saccella charanica Olsson 1931
†Saccella miradorana Olsson 1931
Cl. †Pelecypoda Goldfuss 1820
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Or. Teleodesmacea
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Superfm. Cyrenacea Gray 1840
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Fm. Cyrenidae Gray 1840
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G. Polymesoda Rafinesque 1828
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†Polymesoda bravoensis Olsson 1931
†Polymesoda trigalensis Olsson 1931
Superfm. Mactracea Lamarck 1809
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Superfm. Tellinacea Blainville 1814
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Fm. Donacidae Fleming 1828
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Fm. Psammobiidae Fleming 1828
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Fm. Tellinidae Blainville 1814 [tellin clam]
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Invalid names: Astartacea d'Orbigny 1844 [empty], Cypricardiacea [empty], Isocardiacea [empty]
Superfm. Arcacea Lamarck 1809
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Fm. Cerithiadae Fleming 1822 [cerith snail]
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Fm. Dreissenidae Gray 1840
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Superfm. †Lucinacea Fleming 1828
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Fm. Thyasiridae Dall 1901
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G. Thyasira Lamarck 1818
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†Thyasira montanita Olsson 1931
†Thyasira peruviana Olsson 1931
†Thyasira staufti Olsson 1931
†Thyasira tessaria Olsson 1931
Subfm. Melanopsinae Adams and Adams 1854
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G. †Faunus Montfort 1810
G. †Pseudofaunus Olsson 1931
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†Pseudofaunus bravoensis Olsson 1931
†Pseudofaunus chiraensis Olsson 1931
Superfm. Nuculacea Gray 1824
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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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†Acila paita Olsson 1931
†Acila plura Olsson 1931
Superfm. Pectinacea Rafinesque 1815
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Fm. Mytilidae Rafinesque 1815 [mussel]
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Invalid names: Dreisseniidae Gray 1840 [empty]
Superfm. †Rachiglossa Gray 1853
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Superfm. Veneracea Rafinesque 1815
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Fm. Veneridae Rafinesque 1815 [venus clam]
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G. Antigona Schumacher 1817
G. Artena Conrad 1870
G. Callista Poli 1791
G. Costacallista Palmer 1926
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†Costacallista canoasensis Olsson 1931
†Costacallista mancorensis Olsson 1931
G. Dosinia Scopoli 1777
G. Lamelliconcha Dall 1902
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†Lamelliconcha ayabaca Olsson 1931
†Lamelliconcha charanica Olsson 1931
†Lamelliconcha wolfi Olsson 1931
G. Pitarella Palmer 1927
G. Pitaria Roemer 1857