Classification of Knight 1942
G. †Stegocoelia Donald 1889
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†Stegocoelia wortheni Knight 1942
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Invalid names: Loxonema quadricarinatus Worthen 1884 [replaced]
Fm. †Bellerophontidae M'Coy 1851
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G. †Loxobucania Knight 1942
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†Loxobucania emmonsi Ulrich and Scofield 1897
†Loxobucania frankfortensis Ulrich and Scofield 1897
†Loxobucania gorbyi Miller 1892
†Loxobucania lindsleyi Safford 1869
†Loxobucania micronema Ulrich and Scofield 1897
†Loxobucania nashvillensis Ulrich and Scofield 1897
†Loxobucania singularis Ulrich and Scofield 1897