Classification of the genus Orthis
G. †Orthis Dalman 1828
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Subg. †Orthis (Finkelnburgia) Walcott 1905
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†Orthis (Finkelnburgia) osceola Walcott 1905
†Orthis (Finkelnburgia) osceola corrugata Walcott 1905
†Orthis acuminata Billings 1859
†Orthis australis M'Coy 1847
†Orthis berthoisi Davidson 1869
†Orthis biforata Nicholson 1875
†Orthis biforata reversata Foerste 1885
†Orthis biloba Linnaeus 1758
†Orthis bilobata Portlock 1843
†Orthis callactis Dalman 1827
†Orthis christianae Kjerulf 1865
†Orthis cypha James 1874
†Orthis davidsoni de Verneuil 1845
†Orthis expansa de Sowerby and Murchison 1839
†Orthis intercostata de Sowerby and Murchison 1839
†Orthis kreklingensis Opik 1939
†Orthis laticostata James 1871
†Orthis perveta Conrad 1843
†Orthis piger Billings 1859
†Orthis reversa McCoy 1862
†Orthis ribeiroi Sharpe 1853
†Orthis spinigera M'Coy 1847
†Orthis subalata Ulrich and Cooper 1938
†Orthis testudinaria Dalman 1828
†Orthis tulliensis Vanuxem 1842