Orthonychia mayesense (FOSSIL) Snider, 1915 †
Orthonychia morsei (FOSSIL) J.W. Hall 1843 †
Orthonychia obliquesulcata (FOSSIL) Spitz, 1907 †
Orthonychia occidens (FOSSIL) Walcott, 1884 †
Orthonychia pajerensis (FOSSIL) Chronic, 1949 †
Orthonychia parva (FOSSIL) Shumard & Swallow, 1858 †
Orthonychia parvulum (FOSSIL) J.J.F. Whiteaves, 1892 †
Orthonychia pentalvea (FOSSIL) Talent & Philip, 1956 †
Orthonychia perplexum (FOSSIL) J.W. Hall, 1879 †
Orthonychia prosseri (FOSSIL) A.H. Clarke & Swartz,1913 †
Orthonychia protei (FOSSIL) (Oehlert, 1883 †)
Orthonychia puellaris (FOSSIL) (Whidborne, 1891 †)
Orthonychia quadrangularis (FOSSIL) Whidborne, 1891 †
Orthonychia rostratus (FOSSIL) (Trenkner, 1868 †)
Orthonychia rotunda (FOSSIL) Whidborne, 1896 †
Orthonychia sciotoensis (FOSSIL) Hyde, 1953 †
Orthonychia sileni (FOSSIL) Oehlert, 1883 †
Orthonychia subrectum (FOSSIL) J.W. Hall, 1859 †
Orthonychia talon (FOSSIL) Tolmachoff, 1930 †
Orthonychia tortuosa (FOSSIL) J.W. Hall, 1859 †
Orthonychia trigonale (FOSSIL) (Barrois, 1889 †)
Orthonychia trirotundolobatum (FOSSIL) (Talent & Philip, 1956 †)
Orthonychia undulatum (FOSSIL) (Barrois, 1889 †)
Orthonychia unguiculata (FOSSIL) A.H. Clarke & Swartz,1913 †
Orthonychia ungula (FOSSIL) Weller, 1906 †
Orthonychia variablis (FOSSIL) Tyler, 1965 †
Orthonychia vishtytica (FOSSIL) Saladzius, 1966 †
Orthonychia vomerium (FOSSIL) (Winchell, 1863 †)
Orthonychia wanneri (FOSSIL) Delpey, 1941 †
Orthonychia waverlyensis (FOSSIL) Hyde, 1953 †