Classification of Perrilliat 1972
Fm. Turritellidae Lovén 1847 [turret shell]
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G. Turritella Lamarck 1799 [turret shell]
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†Turritella abrupta Spieker 1922
†Turritella subgrundifera Dall 1892
Turritella terebra Linnaeus 1758
†Turritella tuxtepecensis Bose 1906
Fm. Architectonicidae Gray 1850
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G. Architectonica Röding 1798 [sundial]
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Subg. Architectonica (Pseudotorinia) Sacco 1892
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†Architectonica (Pseudotorinia) euprepes Woodring 1928
Fm. Caecidae Gray 1850
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G. Caecum Fleming 1813
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†Caecum anellifer Pilsbry and Johnson 1917
†Caecum chipolanum Gardner 1947
Caecum mexicanum Collins 1937
†Caecum tomaculum Weisbord 1962
Invalid names: Caecum (Defolinia) Weisbord 1962 [invalid subgroup]
Fm. Neritidae Rafinesque 1815
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Subfm. Smaragdiinae Baker 1923
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G. Smaragdia Issel 1869
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Subg. Smaragdia (Smaragdia) Issel 1869
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Smaragdia (Smaragdia) viridis Linnaeus 1758
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†Smaragdia (Smaragdia) viridis viridemaris Maury 1917
Fm. Rissoidae Gray 1847
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Fm. Trochidae Rafinesque 1815 [top snail]
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Subfm. Calliostomatinae Thiele 1924
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G. Calliostoma Swainson 1840
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Subg. Calliostoma (Calliostoma) Swainson 1840
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Calliostoma (Calliostoma) pulcher Adams 1850
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†Calliostoma (Calliostoma) pulcher mexicana Perrilliat 1972
Fm. Turbinidae Rafinesque 1815
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Fm. Vitrinellidae Bush 1897
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G. Cyclostremiscus Pilsbry and Olsson 1945
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Subg. Cyclostremiscus (Ponocyclus) Pilsbry 1953
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†Cyclostremiscus (Ponocyclus) domingensis Pilsbry and Johnson 1917
†Cyclostremiscus (Ponocyclus) guppyi Mansfield 1925
†Cyclostremiscus (Ponocyclus) pentagonus Gabb 1873
G. †Didianema Woodring 1928
G. Solariorbis Conrad 1865
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†Solariorbis boardmani Perrilliat 1972
†Solariorbis hypolius Pilsbry and Olsson 1952
G. Teinostoma Adams and Adams 1853
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Subg. †Teinostoma (Idioraphe) Pilsbry 1922
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†Teinostoma (Idioraphe) chipolanum Dall 1892
†Teinostoma (Idioraphe) mekon Gardner 1947
Subg. Teinostoma (Pseudorotella) Fischer 1857
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†Teinostoma (Pseudorotella) stemonium Woodring 1957
Subg. Architectonica (Architectonica) Röding 1798
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Architectonica (Architectonica) nobilis Röding 1798
Subfm. Vitrinellinae Bush 1897
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Subg. Fissurella (Fissurella) Bruguière 1789
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†Fissurella (Fissurella) mexicana Perrilliat 1972
Subg. Microgaza (Microgaza) Dall 1881
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†Microgaza (Microgaza) santarosaensis Perrilliat 1972