Classification of the genus Clarkoceras
G. †Clarkoceras Ruedemann 1905
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†Clarkoceras affine Ulrich et al. 1943
†Clarkoceras arcuatum Ulrich et al. 1943
†Clarkoceras buttsi Ulrich et al. 1943
†Clarkoceras calvini Ulrich et al. 1943
†Clarkoceras cinctum Ulrich et al. 1943
†Clarkoceras clelandi Ulrich et al. 1943
†Clarkoceras confertum Ulrich et al. 1943
†Clarkoceras corniculum Sardeson 1896
†Clarkoceras crassum Ulrich et al. 1943
†Clarkoceras cuneatum Ulrich et al. 1943
†Clarkoceras curvatum Ulrich et al. 1943
†Clarkoceras expansum Ulrich et al. 1943
†Clarkoceras gracile Ulrich et al. 1943
†Clarkoceras huzzahense Ulrich et al. 1943
†Clarkoceras inconstans Ulrich et al. 1943
†Clarkoceras jasperense Ulrich et al. 1943
†Clarkoceras lawrencense Ulrich et al. 1943
†Clarkoceras levisense Ulrich et al. 1943
†Clarkoceras luthei Ulrich et al. 1943
†Clarkoceras luthei Calvin 1892
†Clarkoceras magnisiphonatum Ulrich et al. 1943
†Clarkoceras minneiskense Ulrich et al. 1943
†Clarkoceras modestum Ulrich et al. 1943
†Clarkoceras mohawkense Ulrich et al. 1943
†Clarkoceras multicameratum Ulrich et al. 1943
†Clarkoceras newtonwinchelli Clarke 1897
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Invalid names: Clarkoceras claytonense Powell 1935 [synonym]
†Clarkoceras parvisiphonatum Ulrich et al. 1943
†Clarkoceras rectum Ulrich et al. 1943
†Clarkoceras ruedemanni Flower 1964
†Clarkoceras ruguliferum Ulrich et al. 1943
†Clarkoceras subarcuatum Ulrich et al. 1943
†Clarkoceras subcrassum Ulrich et al. 1943
†Clarkoceras subrectum Ulrich et al. 1943
†Clarkoceras vicinum Ulrich et al. 1943
†Clarkoceras whitehallense Ulrich et al. 1943