Classification of the species Orthoceras knoxensis
†Pseudorthoceras knoxense McChesney 1859
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†Mooreoceras normale angusticameratum Miller et al. 1933
Invalid names: Mooreoceras normale Miller et al. 1933 [synonym], Orthoceras cribrosum Geinitz 1866 [synonym], Orthoceras rushensis Meek and Worthen 1873 [synonym], Pseudorthoceras seminolense Girty 1911 [synonym], Pseudorthoceras splendens Clifton 1942 [synonym]