Classification of Thompson 1970
G. †Cyclonema Hall 1852
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†Cyclonema bellulum Billings 1866
†Cyclonema bilix Conrad 1842
†Cyclonema concinnum Hall 1876
†Cyclonema crenulatum Meek 1871
†Cyclonema cushingi Ruedemann 1912
†Cyclonema decora Billings 1866
†Cyclonema gracile Ulrich and Scofield 1897
†Cyclonema hageri Billings 1865
†Cyclonema haliburtoni McLearn 1924
†Cyclonema hallianum Salter 1859
†Cyclonema hamiltoniae Hall 1860
†Cyclonema humerosum Ulrich and Scofield 1897
†Cyclonema inflatum Ulrich and Scofield 1897
†Cyclonema limatum Ulrich and Scofield 1897
†Cyclonema marylandense Prosser and Kindle 1913
†Cyclonema mediale Ulrich and Scofield 1897
†Cyclonema montrealense Billings 1865
†Cyclonema multilirata Hall 1859
†Cyclonema obsolescens Hall 1876
†Cyclonema parvimedium McLearn 1924
†Cyclonema percingulatum Billings 1857
†Cyclonema phaedra Billings 1865
†Cyclonema praecipitum Ulrich and Scofield 1897
†Cyclonema simulans Ulrich and Scofield 1897
†Cyclonema sublaeve Ulrich and Scofield 1897
†Cyclonema thalia Billings 1857
†Cyclonema transversum Ulrich and Scofield 1897
†Cyclonema varians Billings 1857
†Cyclonema varicosum Hall 1861
†Cyclonema varispirum Twenhofel 1928
†Cyclonema ventricosa Hall 1852
G. †Poleumita Clarke and Ruedemann 1903
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†Poleumita rugaelineata Hall and Whitfield 1872
G. †Gyronema Ulrich and Scofield 1897
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†Gyronema historicum Hudson 1905
†Gyronema liratum Hall 1860
†Gyronema pericarinatum Hall 1847
†Gyronema semicarinatum Salter 1859
G. †Strophostylus Hall 1859
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†Strophostylus cancellatus Hall 1847
†Strophostylus elevatus Hall 1868
†Strophostylus textilis Miller 1897