Classification of Maisey 1981
G. †Ctenacanthus Agassiz 1836
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†Ctenacanthus angulatus Newberry and Worthen 1866
†Ctenacanthus angustus Newberry 1889
†Ctenacanthus clarkii Newberry 1889
†Ctenacanthus cliftonensis Branson and Mehl 1938
†Ctenacanthus compressus Newberry 1889
†Ctenacanthus denticulatus McCoy 1855
†Ctenacanthus littoni Newberry 1889
†Ctenacanthus major Agassiz 1836
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Invalid names: Ctenacanthus deflexus St. John and Worthen 1883 [objective synonym], Ctenacanthus harrisoni St. John and Worthen 1883 [objective synonym], Ctenacanthus maximus de Koninck 1878 [synonym], Ctenacanthus salopiensis Davis 1883 [objective synonym], Ctenacanthus spectabilis St. John and Worthen 1875 [objective synonym], Ctenacanthus tenuistriatus Agassiz 1836 [objective synonym], Ctenacanthus varians St. John and Worthen 1875 [objective synonym]
†Ctenacanthus randalli Newberry 1889
†Eunemacanthus heterogyrus McCoy 1855
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Invalid names: Ctenacanthus heterogyrus Agassiz 1837 [objective synonym]