Classification of Kröger et al. 2011
Cl. Cephalopoda Cuvier 1797
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Or. †Orthocerida Kuhn 1940
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Fm. †Dawsonoceratidae Flower 1962
Fm. †Orthoceratidae M'Coy 1844
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G. †Striatocycloceras Kröger and Isakar 2006
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Invalid names: Striatocycloceras foerstei Teichert 1930 [nomen nudum]
Fm. †Proteoceratidae Flower 1962
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Or. †Tarphycerida Flower and Kummel, Jr. 1950
G. †Isorthoceras Flower 1962
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†Isorthoceras bisignatum Barrande 1877
†Isorthoceras dalecarlense Kröger et al. 2011
†Isorthoceras junceum Hall 1877
†Isorthoceras luhai Stumbur 1956
Or. †Oncoceratida Flower and Kummel, Jr. 1950
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Fm. †Oncoceratidae Hyatt 1884
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