Classification of the order Protactinocerida
Or. †Protactinocerida
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G. †Benxioceras
G. †Mastoceras
Fm. †Protactinoceratidae Chen 1979
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G. †Protactinoceras
G. †Sinoeremoceras Kobayashi 1933
G. †Wanwanoceras Kobayashi 1933