Orthonema ascensus (FOSSIL) Anderson & al., 1985 †
Orthonema borovskensis (FOSSIL) Mazaev, 2002 †
Orthonema carbonaria (FOSSIL) A.H. Worthen, 1884 †
Orthonema chorda (FOSSIL) Anderson, Hoare& Sturgeon, 1985 †
Orthonema cochleoides (FOSSIL) (Yin, 1932 †)
Orthonema curtum (FOSSIL) B.S. Kues, 2004 †
Yochelsonistylus felixi (FOSSIL) A. Nützel & Nakazawa,2012 †
Orthonema frequens (FOSSIL) Licharev, 1968 †
Orthonema hulusitaiensis (FOSSIL) Pan, 1997 †
Orthonema illineatus (FOSSIL) Erwin, 1988 †
Orthonema inornatum (FOSSIL) Knight, 1934 †
Orthonema knighti (FOSSIL) Batten, 1985 †
Orthonema laluzense (FOSSIL) B.S. Kues, 2004 †
Orthonema liratum (FOSSIL) Sayre, 1930 †
Orthonema marvinwelleri (FOSSIL) Knight, 1934 †
Orthonema nakazawai (FOSSIL) Batten, 1985 †
Orthonema nebrascense (FOSSIL) H.B. Geinitz, 1866 †
Orthonema paedice (FOSSIL) Erwin, 1988 †
Orthonema panxianensis (FOSSIL) Yu, 1974 †
Orthonema paulum (FOSSIL) Mazaev, 2002 †
Orthonema paxillus (FOSSIL) Erwin, 1988 †
Orthonema pygmaeum (FOSSIL) J. Donald, 1889 †
Orthonema rectimurum (FOSSIL) Batten, 1985 †
Orthonema salteri (FOSSIL) (F.B. Meek& A.H. Worthen, 1860 †)
Orthonema sayrei (FOSSIL) Knight, 1934 †
Orthonema semiornatum (FOSSIL) Anderson & al., 1985 †
Yochelsonistylus seussae (FOSSIL) A. Nützel & Nakazawa,2012 †
Orthonema silinae (FOSSIL) (Licharev, 1975 †)
Neorthonema simoni (FOSSIL) A. Nützel, 2007 †
Orthonema simplex (FOSSIL) Mazaev, 2002 †
Orthonema socorroense (FOSSIL) Girty, 1909 †
Orthonema striatonodosum (FOSSIL) Chronic, 1952 †
Orthonema strigatum (FOSSIL) Warthin Jr., 1930 †
Orthonema subtaeniatum (FOSSIL) H.B. Geinitz, 1866 †
Orthonema telescopiforme (FOSSIL) Erwin, 1988 †