Classification of Cooper 1976

Or. †Lingulida Waagen 1885
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Invalid names: Lingulacea Menke 1828 [empty]
Or. †Kutorginida Kühn 1949
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Superfm. †Kutorginacea Schuchert 1893
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Fm. †Yorkiidae Rowell 1962
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G. †Trematosia Cooper 1976
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†Trematosia radifer Richter and Richter 1941
†Trematosia undulata Cooper 1976
Or. †Obolellida Rowell 1965
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Invalid names: Obolellacea Walcott and Schuchert 1908 [empty]
Or. †Orthida Schuchert and Cooper 1932
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Subor. †Orthidina Schuchert and Cooper 1932
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Superfm. †Orthacea Woodward and Schuchert 1852
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Fm. †Leioriidae Cooper 1976
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G. †Leioria Cooper 1976
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†Leioria bentori Cooper 1976
†Leioria elongata Cooper 1976
Invalid names: Protorthacea Cooper 1976 [empty]