Worthenia castlemanensis (FOSSIL) Lintz Jr., 1958 †
Donaldiella catharina (FOSSIL) (Billings, 1865 †)
Longstaffia centervillensis (FOSSIL) Foerste, 1923 †
Eunema centralis (FOSSIL) Ulrich & Scofield, 1897 †
Donaldiella cicelia (FOSSIL) (Billings, 1865 †)
Proturritella cingulata (FOSSIL) (E.F.R.K. Koken, 1896 †)
Paupospira circe (FOSSIL) (Billings, 1857 †)
Worthenia cirriformis (FOSSIL) (Laube, 1868 †)
Frodospira cochleata (FOSSIL) (Lindström, 1884 †)
Ruedemannia cognata (FOSSIL) (J. Perner, 1903 †)
Longstaffia complexa (FOSSIL) (J. Perner, 1903 †)
Eunema concinnula (FOSSIL) Ulrich & Scofield, 1897 †
Lophospira concurrens (FOSSIL) J. Perner, 1907 †
Hanusispira confinis (FOSSIL) (J. Perner, 1907 †)
Worthenia conica (FOSSIL) Assmann, 1937 †
Lophospira conoidea (FOSSIL) Ulrich & Scofield, 1897 †
Worthenia constantini (FOSSIL) Mansuy, 1912 †
Worthenia contabulata (FOSSIL) Costa, 1964 †
Worthenia corrugata (FOSSIL) Chronic, 1952 †
Ruedemannia crassior (FOSSIL) (J. Perner, 1903 †)
Worthenia crenilunula (FOSSIL) E.K. Yoo, 1994 †
Worthenia crenulata (FOSSIL) Batten, 1989 †
Worthenia curvistriata (FOSSIL) E.F.R.K. Koken& J. Perner, 1925 †
Longstaffia cyclonema (FOSSIL) (Salter, 1873 †)
Proturritella cyclophora (FOSSIL) E.F.R.K. Koken& J. Perner, 1925 †
Lophospira decursa (FOSSIL) Ulrich & Scofield, 1897 †
Platyworthenia delicata (FOSSIL) Chronic, 1952 †
Donaldiella derwiduii (FOSSIL) (A.W. Grabau, 1922 †)
Worthenia distincta (FOSSIL) E.A.L. Kittl, 1894 †
Donaldiella dorothea (FOSSIL) (A.W. Grabau, 1922 †)
Worthenia dregeri (FOSSIL) E.A.L. Kittl, 1891 †
Lophospira dubia (FOSSIL) J. Perner, 1903 †
Worthenia duplicata (FOSSIL) E.A.L. Kittl, 1891 †
Worthenia ecki (FOSSIL) Assmann, 1924 †
Paupospira elevata (FOSSIL) (Ulrich & Scofield,1897 †)