Orthonychia mayesense (FOSSIL) Snider, 1915 †
Orthonychia morsei (FOSSIL) J.W. Hall 1843 †
Orthonychia obliquesulcata (FOSSIL) Spitz, 1907 † Italy, Friuli-Venezia Giulia, Udine
Orthonychia occidens (FOSSIL) Walcott, 1884 † USA, Nevada, Eureka
Orthonychia pajerensis (FOSSIL) Chronic, 1949 † Peru, Vilcanota Valley
Orthonychia parva (FOSSIL) Shumard & Swallow, 1858 † USA, Idaho, Lewis
Orthonychia parvulum (FOSSIL) J.J.F. Whiteaves, 1892 †
Orthonychia pentalvea (FOSSIL) Talent & Philip, 1956 † Australia, Victoria, Wellington - Rosedale
Orthonychia perplexum (FOSSIL) J.W. Hall, 1879 †
Orthonychia prosseri (FOSSIL) A.H. Clarke & Swartz,1913 † USA, Maryland, Garrett
Orthonychia protei (FOSSIL) (Oehlert, 1883 †) France, Pays de la Loire, Mayenne
Orthonychia puellaris (FOSSIL) (Whidborne, 1891 †) UK, Devon
Orthonychia quadrangularis (FOSSIL) Whidborne, 1891 † UK, England, Torbay
Orthonychia rostratus (FOSSIL) (Trenkner, 1868 †) UK, England, Torbay
Orthonychia rotunda (FOSSIL) Whidborne, 1896 † UK, Devon
Orthonychia sciotoensis (FOSSIL) Hyde, 1953 † USA, Ohio, Scioto
Orthonychia sileni (FOSSIL) Oehlert, 1883 †
Orthonychia subrectum (FOSSIL) J.W. Hall, 1859 †
Orthonychia talon (FOSSIL) Tolmachoff, 1930 † Canada, Johns Island
Orthonychia tortuosa (FOSSIL) J.W. Hall, 1859 † Canada, Quebec, Cap-des-Rosiers
Orthonychia trigonale (FOSSIL) (Barrois, 1889 †) France, Pays de la Loire, Loire-Atlantique
Orthonychia trirotundolobatum (FOSSIL) (Talent & Philip, 1956 †) Australia, Victoria, Wellington - Rosedale
Orthonychia undulatum (FOSSIL) (Barrois, 1889 †) France, Pays de la Loire, Loire-Atlantique
Orthonychia unguiculata (FOSSIL) A.H. Clarke & Swartz,1913 † USA, Maryland, Allegany
Orthonychia ungula (FOSSIL) Weller, 1906 † USA, Missouri, Jefferson
Orthonychia variablis (FOSSIL) Tyler, 1965 † United States, Michigan, Alpena
Orthonychia vishtytica (FOSSIL) Saladzius, 1966 †
Orthonychia vomerium (FOSSIL) (Winchell, 1863 †) USA, Iowa, Franklin
Orthonychia wanneri (FOSSIL) Delpey, 1941 † Cambodia, Phnom Anseh
Orthonychia waverlyensis (FOSSIL) Hyde, 1953 † USA, Ohio, Scioto