Classification of the genus Megadesmus
G. †Megadesmus Sowerby 1838
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Subg. †Megadesmus (Megadesmus) Sowerby 1838
†Megadesmus borealis Muromtseva 1984
†Megadesmus deflatus Waterhouse 1983
†Megadesmus dembskajae Guskov 1984
†Megadesmus globlosus Sowerby 1838
†Megadesmus globosus Sowerby 1838
†Megadesmus gryphoides de Koninck 1876
†Megadesmus nobilissimus de Koninck 1876
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Invalid names: Edmondia intermedia de Koninck 1876 [synonym]
†Megadesmus ovalis Sowerby 1847
†Megadesmus pristinus Runnegar 1972
†Megadesmus robusta Laseron 1910
†Megadesmus trigonalis Johnston 1887
Invalid names: Cleobis Dana 1847 [synonym]