Classification of the genus Ptilodictya
G. †Ptilodictya Lonsdale 1839
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†Ptilodictya bifurcata Brood 1978
†Ptilodictya canadensis Billings 1866
†Ptilodictya capillaris Lavrentjeva and Gorjunova 1993
†Ptilodictya ensiformis Hall 1852
†Ptilodictya flabellata Eichwald 1860
†Ptilodictya flagella Nicholson 1875
†Ptilodictya gladiola Billings 1866
†Ptilodictya lanceolata Goldfuss 1829
†Ptilodictya sulcata Billings 1866