Classification of Grabau and Shimer 1909
G. †Cyrtolites Conrad 1838
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†Cyrtolites carinatus Miller 1874
†Cyrtolites ornatus Conrad 1838
G. †Bellerophon de Montfort 1808
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†Bellerophon troosti de Ferrusac and d'Orbigny 1840
G. †Bucania Hall 1847
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†Bucania halli Ulrich and Scofield 1897
†Bucania punctifrons Emmons 1842
G. †Bucanopsis Ulrich and Scofield 1897
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†Bucanopsis carinifera Ulrich and Scofield 1897
†Bucanopsis leda Hall 1859
G. †Carinaropsis Hall 1847
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†Carinaropsis cunulae Hall 1861
†Carinaropsis cymbula Hall 1861
G. †Phragmolites Conrad 1838
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†Phragmolites compressus Conrad 1838
†Phragmolites dyeri Hall 1872
G. †Salpingostoma Roemer 1876
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†Salpingostoma richmondensis Ulrich and Scofield 1897
G. †Tetranota Ulrich and Scofield 1897
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†Tetranota bidorsata Hall 1847
†Tetranota obsoleta Ulrich and Scofield 1897
†Tetranota sexcarinata Ulrich and Scofield 1897
G. †Archinacella Ulrich and Scofield 1897
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†Archinacella simulatrix Ulrich and Scofield 1897
G. †Lophospira Whitfield 1886
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†Lophospira helicteres Salter 1859
†Lophospira perangulata Hall 1847
†Lophospira trilix Hall 1862
†Lophospira wisconsinensis Ulrich and Scofield 1897
G. †Loxonema Phillips 1841
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†Loxonema hamiltoniae Hall 1859
†Loxonema terebra Hall 1879
G. †Palaeocapulus Grabau and Shimer 1909
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†Palaeocapulus equilateralis Hall 1859
†Palaeocapulus lodiensis Meek 1871
G. †Protowarthia Ulrich and Scofield 1897
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†Protowarthia cancellata Hall 1847
†Protowarthia pervoluta Ulrich and Scofield 1897