Classification of Girty 1915
G. †Lophophyllum Milne-Edwards and Haime 1850
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†Lophophyllum profundum Milne-Edward and Haime 1851
G. †Patellostium Waagen 1880
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†Patellostium branneri Weller 1897
†Patellostium montfortianum Norwood and Pratten 1855
G. †Euomphalus Sowerby 1814
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†Euomphalus angularis Weller 1900
†Euomphalus planidorsatus Meek and Worthen 1860
†Euomphalus utahensis Hall and Whitfield 1877
G. †Holopea Hall 1847
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†Holopea micula Girty 1909
†Holopea oligospira Winchell 1863
†Holopea peoriensis Worthen 1884
†Holopea proutana Hall 1856
†Holopea shumardana Winchell 1863
†Holopea subcorpulenta Whitfield 1882
G. †Straparollus de Montfort 1810
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†Straparollus planispira Hall 1856
†Straparollus quadrivolvis Hall 1856
G. †Phanerotrema Fischer 1885
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†Phanerotrema grayvillense Norwood and Pratten 1855
G. †Zygopleura
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†Zygopleura multicostata Meek and Worthen 1862
†Zygopleura parva Cox 1857
†Zygopleura plebiea Herrick 1887
†Zygopleura rugosa Meek and Worthen 1860
Cl. †Articulata Huxley 1869
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G. †Sphaerodoma Keyes 1889
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†Sphaerodoma fusiformis Hall 1858
†Sphaerodoma intercalaris Meek and Worthen 1860
†Sphaerodoma medialis Meek and Worthen 1860
†Sphaerodoma melanoides Whitfield 1882
†Sphaerodoma paludiniformis Hall 1858
†Sphaerodoma pinguis Winchell 1863
†Sphaerodoma primigenia Conrad 1835
†Sphaerodoma ventricosa Hall 1858
G. †Orestes Girty 1912
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†Orestes brazoensis Shumard 1860
†Orestes nodosus Girty 1912
†Straparollus similis Meek and Worthen 1862
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†Straparollus similis planus Girty 1915
†Pseudomonotis kansasensis Beede 1900
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Invalid names: Pseudomonotis carbonaria Meek and Worthen 1866 [synonym]