Classification of the family Orthacanthidae
Fm. †Orthacanthidae Heyler and Poplin 1989
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G. †Orthacanthus Agassiz 1843
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†Orthacanthus buxieri Heyler and Poplin 1989
†Orthacanthus compressus Newberry 1856
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Invalid names: Diplodus latus Newberry 1856 [synonym], Diplodus penetrans Dawson 1868 [synonym]
†Orthacanthus donnelljohnsi Johnson and Thayer 2009
†Orthacanthus gibbosus Agassiz 1843
†Orthacanthus gracilis Giebel 1848
†Orthacanthus milleri Agassiz 1843
†Orthacanthus minor Agassiz 1843
†Orthacanthus platypternus Cope 1884
†Orthacanthus pustulosus Agassiz 1843
†Orthacanthus texensis Cope 1888
Invalid names: Chilodus Giebel 1847 [synonym], Didymodus Cope 1883 [synonym], Diplodus Agassiz 1843 [synonym], Dittodus Owen 1867 [synonym], Giebelodus Whitley 1940 [synonym]