Classification of Mudge et al. 1962

G. †Amphiscapha Knight 1942
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Amphiscapha muricata Knight 1934
G. †Naticopsis M'Coy 1844
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Naticopsis subovata Meek and Worthen 1873
G. †Phymatopleura Girty 1939
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Phymatopleura brazoensis Shumard 1860
G. Yoldia Möller 1842
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Yoldia subscitula Meek and Hayden 1858
G. Lingula Bruguiére 1797
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Lingula carbonaria Shumard and Swallow 1858
G. †Orbiculoidea d'Orbigny 1847
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G. †Petrocrania Raymond 1910
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Petrocrania modesta White and St. John 1867
G. †Enteletes Waldheim 1825
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Rhipidomella carbonaria Shumard and Swallow 1858
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Cancrinella boonensis Swallow 1858
G. †Chonetes Fischer de Waldheim 1830
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Chonetes granulifer Owen 1852
G. †Derbyia Waagen 1884
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Derbyia crassa Meek and Hayden 1858
Derbyia cymbula Hall and Clarke 1893
Derbyia hooserensis Dunbar and Condra 1932
Derbyia wabaunseensis Dunbar and Condra 1932
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Invalid names: Dictyoclostus americanus Dunbar and Condra 1932 [synonym]
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Echinoconchus moorei Dunbar and Condra 1932
G. †Juresania Fredericks 1928
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G. †Leptalosia Dunbar and Condra 1932
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Leptalosia ovalis Dunbar and Condra 1932
G. †Lissochonetes Dunbar and Condra 1932
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Lissochonetes geronticus Dunbar and Condra 1932
G. †Marginifera Waagen 1884
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Marginifera histricula Dunbar and Condra 1932
Marginifera lasallensis Worthen 1873
Marginifera wabashensis Norwood and Pratten 1855
G. †Meekella
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G. †Wellerella Dunbar and Condra 1932
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Wellerella delicatula Dunbar and Condra 1932
Wellerella osagensis Shumard and Swallow 1858
Wellerella truncata Dunbar and Condra 1932
G. †Composita Brown 1849
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Composita subtilita Hall 1852
G. †Crurithyris George 1931
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Crurithyris expansa Dunbar and Condra 1932
G. †Hustedia Hall and Clarke 1893
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Hustedia mormoni Marcou 1858
G. †Neospirifer Fredericks 1919
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Neospirifer dunbari King 1933
Neospirifer kansasensis Swallow 1866
G. †Punctospirifer North 1920
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G. †Dielasma King 1856
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Dielasma bovidens Morton 1836
Subg. †Knightites (Retispira) Knight 1945
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Allorisma terminale Hall 1852
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Invalid names: Allorisma subcuneata Meek and Hayden 1858 [synonym]
G. †Linoproductus Chao 1927
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Linoproductus prattenianus Norwood and Pratten 1855