Classification of Kues 1996

G. †Bellerophon de Montfort 1808
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†Bellerophon wewokanus Girty 1912
G. †Pharkidonotus Girty 1912
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G. †Euomphalus Sowerby 1814
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†Euomphalus plummeri Knight 1934
G. †Euconospira Ulrich and Scofield 1897
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†Euconospira turbiniformis Meek and Worthen 1860
G. †Goniasma Tomlin 1930
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†Goniasma lasallensis Worthen 1890
G. †Trepospira Ulrich and Scofield 1897
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†Trepospira illinoisensis Worthen 1884
G. †Worthenia de Koninck 1883
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†Worthenia tabulata Conrad 1835
G. †Clavicosta Newell 1938
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†Clavicosta echinata Newell 1938
Subg. †Platyceras (Orthonychia) Hall 1843
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†Platyceras (Orthonychia) parva Shumard and Swallow 1858