Classification of the subgenus Megistaspis (Ekeraspis)
Subg. †Megistaspis (Ekeraspis) Tjernvik 1956
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†Megistaspis (Ekeraspis) armata Tjernvik 1956
†Megistaspis (Ekeraspis) euclides Walcott 1925
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Invalid names: Megistaspis (Ekeraspis) albertensis Walcott 1925 [synonym]
†Megistaspis (Ekeraspis) floweri Ross 1970
†Megistaspis (Ekeraspis) heroides Brøgger 1882
†Megistaspis (Ekeraspis) nevadensis Ross 1970