Classification of the genus Periplomya
G. †Periplomya Conrad 1870
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†Periplomya inequilateralis Gabb 1864
†Periplomya oregonensis Gabb 1864
†Periplomya quadrata Gabb 1869
†Periplomya reddingensis Anderson 1938
†Periplomya trinitensis Anderson 1938
†Periplomya tryoniana Gabb 1864
†Periplomya whitneyi Gabb 1864