Classification of the genus Undularia
G. †Undularia Koken 1892
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Subg. †Undularia (Orthostomia) Kittl 1899
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†Undularia (Orthostomia) ambrosinii Stoppani 1858
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Invalid names: Trochus cainalli Stoppani 1858 [synonym], Trochus incisus Stoppani 1858 [synonym]
†Undularia (Orthostomia) brevissima Kittl 1894
†Undularia (Orthostomia) concava Stoppani 1857
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Invalid names: Chemnitzia trochoides Stoppani 1857 [synonym]
†Undularia (Orthostomia) fusoides Stoppani 1857
†Undularia (Orthostomia) pillae Stoppani 1858
Subg. †Undularia (Stereokion)
†Undularia disputata Kittl 1899
†Undularia scalata von Schlotheim 1892