Classification of Shimer and Shrock 1944
G. Nucula Lamarck 1799
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G. †Aviculopecten M'Coy 1851
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Subg. †Aviculopecten (Annuliconcha) Newell 1938
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†Aviculopecten (Annuliconcha) interlineatus Meek and Worthen 1860
G. †Orbiculoidea d'Orbigny 1847
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†Orbiculoidea manhattanensis Meek and Hayden 1858
Cl. †Articulata Huxley 1869
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Invalid names: Punctospiracea Shimer and Shrock 1944 [empty]
G. †Schizophoria King 1850
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†Schizophoria macfarlanii Meek 1868
†Schizophoria swallovi Weller 1914
G. †Chonetinella Ramsbottom 1952
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†Chonetinella crassiradiata Dunbar and Condra 1932
G. †Mesolobus Dunbar and Condra 1932
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†Mesolobus decipiens Girty 1912
†Mesolobus euampygus Girty 1912
†Mesolobus lioderma Dunbar and Condra 1932