Classification of the genus Buttsoceras
G. †Buttsoceras Ulrich and Foerste 1933
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†Buttsoceras adamsi Butts 1926
†Buttsoceras atticus Billings 1865
†Buttsoceras novemexicanum Flower 1962
†Buttsoceras odenvillense Ulrich et al. 1944
†Buttsoceras vandiverense Ulrich et al. 1944
†Buttsoceras williamsi Flower 1962