Classification of Flower 1964

G. †Caseoceras Ulrich et al. 1943
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Caseoceras obesum Flower 1964
G. †Clarkoceras Ruedemann 1905
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G. †Rioceras Flower 1964
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Rioceras consuetum Sardeson 1896
Rioceras dartoni Flower 1964
Rioceras depressum Flower 1964
Rioceras expansum Flower 1964
Rioceras fusiforme Flower 1964
Rioceras lobatum Flower 1964
Rioceras nondescriptum Flower 1964
Rioceras pusillum Ruedemann 1906
Rioceras tubulare Flower 1964
Rioceras wellsi Flower 1964
Subcl. Nautiloidea Agassiz 1847 [nautiloid]
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Or. †Ellesmeroceratida Flower and Kummel, Jr. 1950
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G. †Cyptendocerina Ulrich et al. 1944
Invalid names: Ellesmeroceratina Flower 1950 [empty], Plectronoceratina Flower 1964 [empty]
G. †Rhabdiferoceras Flower 1964
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