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Genus: Orthonychia Hall, 1843 † (DB: 65 SP)
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Orthonychia aculeata
Barrois, 1889 † (FOSSIL)
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Orthonychia acuta
F.A. Roemer, 1856 † (FOSSIL)
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Orthonychia acutirostris
J.W. Hall, 1856 † (FOSSIL)
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Orthonychia aroostooki
Williams & M. Breger, 1916 † (FOSSIL)
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Orthonychia baldwini
Rohr & al., 1981 † (FOSSIL)
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Orthonychia belli
A.H. Clarke, 1908 † (FOSSIL)
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Orthonychia bowsheri
E.L. Yochelson, 1956 † (FOSSIL)
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Orthonychia campanulata
Barrois, 1889 † (FOSSIL)
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Orthonychia chesterense
F.B. Meek & A.H. Worthen, 1867 † (FOSSIL)
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Orthonychia compressa
Williams & M. Breger, 1916 † (FOSSIL)
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Orthonychia compressum
Girty, 1910 † (FOSSIL)
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Orthonychia concavum
J.W. Hall, 1859 † (FOSSIL)
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Orthonychia conicum
J.W. Hall, 1859 † (FOSSIL)
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Orthonychia conoidea
G.A. Goldfuss, 1844 † (FOSSIL)
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Orthonychia conoideum
(Barrois, 1889 †) (FOSSIL)
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Orthonychia cornuforme
Winchell, 1863 † (FOSSIL)
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Orthonychia cornuta
Tschernischeff, 1885 † (FOSSIL)
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Orthonychia costata
Barrois, 1889 † (FOSSIL)
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Orthonychia daschi
Rohr & Smith, 1978 † (FOSSIL)
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Orthonychia dentalium
J.W. Hall, 1862 † (FOSSIL)
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Orthonychia dubium
(Barrois, 1889 †) (FOSSIL)
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Orthonychia egorovi
Mazaev, 1996 † (FOSSIL)
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Orthonychia elegans
J. Perner, 1903 † (FOSSIL)
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Orthonychia enorme
(Lindström, 1884 †) (FOSSIL)
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Orthonychia erectum
J.W. Hall 1843 † (FOSSIL)
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Orthonychia extensum
(Barrois, 1889 †) (FOSSIL)
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Orthonychia gracilis
Mansuy, 1913 † (FOSSIL)
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Orthonychia hebes
J.W. Hall 1843 † (FOSSIL)
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Orthonychia herzeri
(Winchell, 1871 †) (FOSSIL)
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Orthonychia inequilaterale
(Barrois, 1889 †) (FOSSIL)
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Orthonychia infabricatus
Hyde, 1953 † (FOSSIL)
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Orthonychia ivanovi
Mazaev, 1996 † (FOSSIL)
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Orthonychia jeffersonensis
Weller, 1906 † (FOSSIL)
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Orthonychia lodiensis
J.W. Hall 1843 † (FOSSIL)
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Orthonychia marblecreekensis
Talent & Philip, 1956 † (FOSSIL)
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Orthonychia mayesense
Snider, 1915 † (FOSSIL)
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Orthonychia morsei
J.W. Hall 1843 † (FOSSIL)
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Orthonychia obliquesulcata
Spitz, 1907 † (FOSSIL)
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Orthonychia occidens
Walcott, 1884 † (FOSSIL)
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Orthonychia pajerensis
Chronic, 1949 † (FOSSIL)
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Orthonychia parva
Shumard & Swallow, 1858 † (FOSSIL)
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Orthonychia parvulum
J.J.F. Whiteaves, 1892 † (FOSSIL)
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Orthonychia pentalvea
Talent & Philip, 1956 † (FOSSIL)
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Orthonychia perplexum
J.W. Hall, 1879 † (FOSSIL)
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Orthonychia prosseri
A.H. Clarke & Swartz, 1913 † (FOSSIL)
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Orthonychia protei
(Oehlert, 1883 †) (FOSSIL)
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Orthonychia puellaris
(Whidborne, 1891 †) (FOSSIL)
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Orthonychia quadrangularis
Whidborne, 1891 † (FOSSIL)
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Orthonychia rostratus
(Trenkner, 1868 †) (FOSSIL)
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Orthonychia rotunda
Whidborne, 1896 † (FOSSIL)
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Orthonychia sciotoensis
Hyde, 1953 † (FOSSIL)
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Orthonychia sileni
Oehlert, 1883 † (FOSSIL)
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Orthonychia subrectum
J.W. Hall, 1859 † (FOSSIL)
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Orthonychia talon
Tolmachoff, 1930 † (FOSSIL)
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Orthonychia tortuosa
J.W. Hall, 1859 † (FOSSIL)
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Orthonychia trigonale
(Barrois, 1889 †) (FOSSIL)
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Orthonychia trirotundolobatum
(Talent & Philip, 1956 †) (FOSSIL)
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Orthonychia undulatum
(Barrois, 1889 †) (FOSSIL)
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Orthonychia unguiculata
A.H. Clarke & Swartz, 1913 † (FOSSIL)
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Orthonychia ungula
Weller, 1906 † (FOSSIL)
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Orthonychia variablis
Tyler, 1965 † (FOSSIL)
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Orthonychia vishtytica
Saladzius, 1966 † (FOSSIL)
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Orthonychia vomerium
(Winchell, 1863 †) (FOSSIL)
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Orthonychia wanneri
Delpey, 1941 † (FOSSIL)
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Orthonychia waverlyensis
Hyde, 1953 † (FOSSIL)
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