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ascensus, Orthonema ascensus Anderson & al., 1985 † (FOSSIL)
bilineatum, Orthonema bilineatum Meek & Worthen, 1860 † - syn of: Orthonema salteri (Meek & Worthen, 1860) † (FOSSIL)
borovskensis, Orthonema borovskensis Mazaev, 2002 † (FOSSIL)
carbonaria, Orthonema carbonaria Worthen, 1884 † (FOSSIL)
chorda, Orthonema chorda Anderson, Hoare & Sturgeon, 1985 † (FOSSIL)
cochleoides, Orthonema cochleoides (Yin, 1932) † (FOSSIL)
columnare, Orthonema columnare Erwin, 1988 † - syn of: Bicuerda columnare (Erwin, 1988) † (FOSSIL)
conicum, Orthonema conicum Meek & Worthen, 1860 † - syn of: Orthonema salteri (Meek & Worthen, 1860) † (FOSSIL)
curtum, Orthonema curtum Kues, 2004 † (FOSSIL)
dozierensis, Orthonema dozierensis Beede, 1907 † - syn of: Taosia dozierensis (Beede, 1907) † (FOSSIL)
felixi, Yochelsonistylus felixi Nützel & Nakazawa, 2012 † (FOSSIL)
frequens, Orthonema frequens Licharev, 1968 † (FOSSIL)
hulusitaiensis, Orthonema hulusitaiensis Pan, 1997 † (FOSSIL)
illineatus, Orthonema illineatus Erwin, 1988 † (FOSSIL)
inornatum, Orthonema inornatum Knight, 1934 † (FOSSIL)
knighti, Orthonema knighti Batten, 1985 † (FOSSIL)
laluzense, Orthonema laluzense Kues, 2004 † (FOSSIL)
liratum, Orthonema liratum Sayre, 1930 † (FOSSIL)
marvinwelleri, Orthonema marvinwelleri Knight, 1934 † (FOSSIL)
nakazawai, Orthonema nakazawai Batten, 1985 † (FOSSIL)
nebrascense, Orthonema nebrascense Geinitz, 1866 † (FOSSIL)
newberryi, Orthonema newberryi Meek, 1871 † - syn of: Acanthonema newberryi (Meek, 1871) † (FOSSIL)
paedice, Orthonema paedice Erwin, 1988 † (FOSSIL)
panxianensis, Orthonema panxianensis Yu, 1974 † (FOSSIL)
paulum, Orthonema paulum Mazaev, 2002 † (FOSSIL)
paxillus, Orthonema paxillus Erwin, 1988 † (FOSSIL)
pygmaeum, Orthonema pygmaeum Donald, 1889 † (FOSSIL)
rara, Orthonema rara Licharev, 1975 † - syn of: Orthonema silinae (Licharev, 1975) † (FOSSIL)
rectimurum, Orthonema rectimurum Batten, 1985 † (FOSSIL)
salteri, Orthonema salteri (Meek & Worthen, 1860) † (FOSSIL)
sayrei, Orthonema sayrei Knight, 1934 † (FOSSIL)
semiornatum, Orthonema semiornatum Anderson & al., 1985 † (FOSSIL)
seussae, Yochelsonistylus seussae Nützel & Nakazawa, 2012 † (FOSSIL)
silinae, Orthonema silinae (Licharev, 1975) † (FOSSIL)
simoni, Neorthonema simoni Nützel, 2007 † (FOSSIL)
simplex, Orthonema simplex Mazaev, 2002 † (FOSSIL)
socorroense, Orthonema socorroense Girty, 1909 † (FOSSIL)
striatonodosum, Orthonema striatonodosum Chronic, 1952 † (FOSSIL)
strigatum, Orthonema strigatum Warthin Jr., 1930 † (FOSSIL)
subtaeniatum, Orthonema subtaeniatum Geinitz, 1866 † (FOSSIL)
telescopiforme, Orthonema telescopiforme Erwin, 1988 † (FOSSIL)
texana, Orthonema texana Beede, 1907 † - syn of: Cibecuia gouldii (Beede, 1907) † (FOSSIL)
tirusum, Orthonema tirusum Batten, 1985 † (FOSSIL)
tricingulatum, Orthonema tricingulatum Erwin, 1988 † (FOSSIL)
volgensis, Kazanella volgensis (Golowinsky, 1868) † (FOSSIL)
werneri, Orthonema werneri Meek & Worthen, 1860 † - syn of: Orthonema salteri (Meek & Worthen, 1860) † (FOSSIL)
youngianum, Orthonema youngianum Donald, 1889 † (FOSSIL)
zionensis, Orthonema zionensis Nützel, 1998 † (FOSSIL)
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