Classification of Miller 1945
G. †Pseudogastrioceras Spath 1936
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†Pseudogastrioceras cooperi Miller 1945
†Pseudogastrioceras roadense Böse 1919
G. †Waagenoceras Gemmellaro 1887
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†Waagenoceras dieneri Böse 1919
†Waagenoceras guadalupense Girty 1908
G. †Medlicottia Waagen 1880
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†Medlicottia burckhardti Böse 1919
†Medlicottia whitneyi Böse 1919