Classification of Flower 1964
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]