| ? trigonale Barrois, 1889
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? dubium Barrois, 1889
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? rostratus Trenkner, 1868
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? enorme Lindström, 1884
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? subrectum Hall, 1859
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? infabricatus Hyde, 1953
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? baldwini Rohr et al., 1981
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? puellaris Whidborne, 1891
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? concavum Hall, 1859
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? parva Shumard & Swallow, 1858
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? compressa Girty, 1910
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? egorovi Mazaev, 1996
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? tortuosum Hall, 1859
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? inequilaterale Barrois, 1889
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? rotunda Whidborne, 1896
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? conicum Hall, 1859
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? quadrangularis Whidborne, 1891
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? chesterense Meek & Worthen, 1867
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? spinigerum Worthen, 1883
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? trirotundolobatum Talent & Philip, 1956
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? cornutum Tschernischew, 1885
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? sileni Oehlert, 1883
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? aculeatum Barrois, 1889
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? conoidea Goldfuss, 1844
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? perplexum Hall, 1879
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? undulatum Barrois, 1889
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? parvulum Whiteaves, 1892
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? gracilis Mansuy, 1913
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? occidens Walcott, 1884
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? sciotoensis Hyde, 1953
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? extensum Barrois, 1889
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? belli Clarke, 1908
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? cornuforme Winchell, 1863
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? herzeri Winchell, 1871
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? waverlyensis Hyde, 1953
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? bowsheri Yochelson, 1956
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? dentalium Hall, 1862
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? protei Oehlert, 1883
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? campanulatum Barrois, 1889
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? vomerium Winchell, 1863
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| ? variablis Tyler, 1965
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| Igoceras Hall, 1859
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Igoceras
|
N/A
|
N/A
|
| Orthonychia Hall, 1843
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| ? girzenbergense Kirchner, 1915
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Vltaviellidae
|
N/A
|
N/A
|
N/A
|
| Eifelcyrtus Frýda & Heidelberger, 2003
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Vltaviellidae
|
Eifelcyrtus
|
N/A
|
N/A
|
| Soetenichia Heidelberger & Bandel, 1999
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Vltaviellidae
|
Soetenichia
|
N/A
|
N/A
|
| Krameriella Frýda & Heidelberger, 2003
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Vltaviellidae
|
Krameriella
|
N/A
|
N/A
|
| Vltaviella Frýda & Manda, 1997
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Vltaviellidae
|
Vltaviella
|
N/A
|
N/A
|
| Cyrtoneritimorpha
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
N/A
|
N/A
|
N/A
|
N/A
|
| Orthonychiidae
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
N/A
|
N/A
|
N/A
|
| Vltaviellidae
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Vltaviellidae
|
N/A
|
N/A
|
N/A
|
| Platyceras subrectum (Hall, 1859)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Orthonychia ascia X.-D.Qiao, 1983
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras aroostooki Williams & Breger, 1916
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Orthonychia conoideum Barrois, 1889
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras waverlyensis (Hyde, 1953)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Capulus parva (Shumard & Swallow, 1858)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Orthonychia wanneri Delpey, 1941
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras inequilaterale (Barrois, 1889)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Orthonychia vishtytica Saladzius, 1966
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras belli (Clarke, 1908)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Capulus quadrangularis (Whidborne, 1891)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras chesterense (Meek & Worthen, 1867)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras undulatum (Barrois, 1889)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Orthonychia obliquesulata Spitz, 1907
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras herzeri (Winchell, 1871)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras sciotoensis (Hyde, 1953)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Capulus rostratus (Trenkner, 1868)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Fissurella conoidea (Goldfuss, 1844)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Orthonychia korotkovae Mazaev, 2019
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras baldwini (Rohr et al., 1981)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras extensum (Barrois, 1889)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Capulus cornuforme (Winchell, 1863)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras campanulatum (Barrois, 1889)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras cornutum (Tschernischew, 1885)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Orthonychia compressa (Girty, 1910)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras gracile (Mansuy, 1913)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Capulus puellaris (Whidborne, 1891)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras perplexum (Hall, 1879)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Orthonychia pentalvea Talent & Philip, 1956
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras dubium (Barrois, 1889)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Orthonychia unguiculata Clarke & Swartz, 1913
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras vomerium (Winchell, 1863)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras trirotundolobatum (Talent & Philip, 1956)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Orthonychia prosseri Clarke & Swartz, 1913
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Orthonychia piso Walcott, 1884
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras trigonale (Barrois, 1889)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Orthonychia marblecreekensis Talent & Philip, 1956
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Orthonychia acuta Roemer, 1856
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Capulus rotunda (Whidborne, 1896)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Orthonychia equilaterum Hall, 1859
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Orthonychia zhifangensis X.-D.Qiao, 1983
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras spinigerum (Worthen, 1883)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Orthonychia haerjawensis X.-D.Qiao, 1983
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras egorovi (Mazaev, 1996)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras infabricatus (Hyde, 1953)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Orthonychia pajerensis Chronic, 1949
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras dentalium (Hall, 1862)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Platyceras concavum (Hall, 1859)
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|
| Orthonychia jeffersonensis Weller, 1906
|
Animalia
|
Mollusca
|
Gastropoda
|
Cyrtoneritida
|
Orthonychiidae
|
Orthonychia
|
N/A
|
N/A
|