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abundans, Orthonychia abundans Wanner, 1922 † - syn of: Platyceras abundans (Wanner, 1922) † (FOSSIL)
aculeata, Orthonychia aculeata Barrois, 1889 † (FOSSIL)
acuta, Orthonychia acuta Roemer, 1856 † (FOSSIL)
acutirostris, Orthonychia acutirostris Hall, 1856 † (FOSSIL)
alata, Orthonychia alata Laube, 1869 † - syn of: Pseudorthonychia alata (Laube, 1869) † (FOSSIL)
aroostooki, Orthonychia aroostooki Williams & Breger, 1916 † (FOSSIL)
baldwini, Orthonychia baldwini Rohr & al., 1981 † (FOSSIL)
belli, Orthonychia belli Clarke, 1908 † (FOSSIL)
bowsheri, Orthonychia bowsheri Yochelson, 1956 † (FOSSIL)
campanulata, Orthonychia campanulata Barrois, 1889 † (FOSSIL)
chesterense, Orthonychia chesterense Meek & Worthen, 1867 † (FOSSIL)
compressa, Orthonychia compressa Williams & Breger, 1916 † (FOSSIL)
compressum, Orthonychia compressum Girty, 1910 † (FOSSIL)
concavum, Orthonychia concavum Hall, 1859 † (FOSSIL)
conicum, Orthonychia conicum Hall, 1859 † (FOSSIL)
conoidea, Orthonychia conoidea Goldfuss, 1844 † (FOSSIL)
conoideum, Orthonychia conoideum (Barrois, 1889) † (FOSSIL)
cornuforme, Orthonychia cornuforme Winchell, 1863 † (FOSSIL)
cornuta, Orthonychia cornuta Tschernischeff, 1885 † (FOSSIL)
costata, Orthonychia costata Barrois, 1889 † (FOSSIL)
daschi, Orthonychia daschi Rohr & Smith, 1978 † (FOSSIL)
dentalium, Orthonychia dentalium Hall, 1862 † (FOSSIL)
dubium, Orthonychia dubium (Barrois, 1889) † (FOSSIL)
egorovi, Orthonychia egorovi Mazaev, 1996 † (FOSSIL)
elegans, Orthonychia elegans Perner, 1903 † (FOSSIL)
enorme, Orthonychia enorme (Lindström, 1884) † (FOSSIL)
erectum, Orthonychia erectum Hall, 1843 † (FOSSIL)
extensum, Orthonychia extensum (Barrois, 1889) † (FOSSIL)
extenuata, Orthonychia extenuata Perner, 1903 † - syn of: Barrandicellopsis extenuata (Perner, 1903) † (FOSSIL)
gracilis, Orthonychia gracilis Mansuy, 1913 † (FOSSIL)
hebes, Orthonychia hebes Hall, 1843 † (FOSSIL)
herzeri, Orthonychia herzeri (Winchell, 1871) † (FOSSIL)
inequilaterale, Orthonychia inequilaterale (Barrois, 1889) † (FOSSIL)
infabricatus, Orthonychia infabricatus Hyde, 1953 † (FOSSIL)
ivanovi, Orthonychia ivanovi Mazaev, 1996 † (FOSSIL)
jeffersonensis, Orthonychia jeffersonensis Weller, 1906 † (FOSSIL)
lodiensis, Orthonychia lodiensis Hall, 1843 † (FOSSIL)
marblecreekensis, Orthonychia marblecreekensis Talent & Philip, 1956 † (FOSSIL)
mayesense, Orthonychia mayesense Snider, 1915 † (FOSSIL)
morsei, Orthonychia morsei Hall, 1843 † (FOSSIL)
obliquesulcata, Orthonychia obliquesulcata Spitz, 1907 † (FOSSIL)
occidens, Orthonychia occidens Walcott, 1884 † (FOSSIL)
pajerensis, Orthonychia pajerensis Chronic, 1949 † (FOSSIL)
parva, Orthonychia parva Shumard & Swallow, 1858 † (FOSSIL)
parvulum, Orthonychia parvulum Whiteaves, 1892 † (FOSSIL)
pentalvea, Orthonychia pentalvea Talent & Philip, 1956 † (FOSSIL)
perplexum, Orthonychia perplexum Hall, 1879 † (FOSSIL)
prosseri, Orthonychia prosseri Clarke & Swartz, 1913 † (FOSSIL)
protei, Orthonychia protei (Oehlert, 1883) † (FOSSIL)
puellaris, Orthonychia puellaris (Whidborne, 1891) † (FOSSIL)
quadrangularis, Orthonychia quadrangularis Whidborne, 1891 † (FOSSIL)
rostratus, Orthonychia rostratus (Trenkner, 1868) † (FOSSIL)
rotunda, Orthonychia rotunda Whidborne, 1896 † (FOSSIL)
sciotoensis, Orthonychia sciotoensis Hyde, 1953 † (FOSSIL)
sileni, Orthonychia sileni Oehlert, 1883 † (FOSSIL)
subrectum, Orthonychia subrectum Hall, 1859 † (FOSSIL)
talon, Orthonychia talon Tolmachoff, 1930 † (FOSSIL)
tortuosa, Orthonychia tortuosa Hall, 1859 † (FOSSIL)
trigonale, Orthonychia trigonale (Barrois, 1889) † (FOSSIL)
trirotundolobatum, Orthonychia trirotundolobatum (Talent & Philip, 1956) † (FOSSIL)
undata, Orthonychia undata Winchell, 1865 † - syn of: Palaeocapulus undata (Winchell, 1865) † (FOSSIL)
undulatum, Orthonychia undulatum (Barrois, 1889) † (FOSSIL)
unguiculata, Orthonychia unguiculata Clarke & Swartz, 1913 † (FOSSIL)
ungula, Orthonychia ungula Weller, 1906 † (FOSSIL)
variablis, Orthonychia variablis Tyler, 1965 † (FOSSIL)
vishtytica, Orthonychia vishtytica Saladzius, 1966 † (FOSSIL)
vomerium, Orthonychia vomerium (Winchell, 1863) † (FOSSIL)
wanneri, Orthonychia wanneri Delpey, 1941 † (FOSSIL)
waverlyensis, Orthonychia waverlyensis Hyde, 1953 † (FOSSIL)
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