Longstaffia teretiuscula (FOSSIL) (J. Perner, 1907 †)
Lophospira terrassa (FOSSIL) A.W. Grabau, 1922 †
Lophospira tesakovi (FOSSIL) Kurushin, 1986 †
Donaldiella tetracarina (FOSSIL) O. Kobayashi, 1930 †
Paupospira thebesensis (FOSSIL) (Savage, 1913 †)
Yochelsonospira thomasi (FOSSIL) (Elias, 1958 †)
Arjamannia thraivensis (FOSSIL) (Longst, 1924 †)
Hanusispira tibidiensis (FOSSIL) (Blodgett & al., 1999 †)
Eunema tietzei (FOSSIL) E.A.L. Kittl, 1894 †
Ruedemannia tolli (FOSSIL) (E.F.R.K. Koken, 1897 †)
Worthenia tongxinensis (FOSSIL) (H. Guo, 1983 †)
Frodospira tortuosa (FOSSIL) (Lindström, 1884 †)
Eunema trilineata (FOSSIL) J.W. Hall, 1868 †
Paupospira trilineata (FOSSIL) (Foerste, 1923 †)
Ruedemannia trilix (FOSSIL) (J.W. Hall, 1862 †)
Proturritella trimarginata (FOSSIL) (K.E.I. von Eichwald,1840 †)
Lophospira trispiralis (FOSSIL) J. Donald, 1906 †
Worthenia triton (FOSSIL) (A.V.M.D. D'Orbigny,1849 †)
Paupospira tropidophora (FOSSIL) (F.B. Meek, 1873 †)
Worthenia tuberculifera (FOSSIL) E.F.R.K. Koken, 1900 †
Longstaffia tubulosa (FOSSIL) (Lindström, 1884 †)
Arjamannia turrita (FOSSIL) (Portlock, 1843 †)
Manzanospira turrita (FOSSIL) Pan & Erwin, 2002 †
Longstaffia uniformis (FOSSIL) (Reed, 1901 †)
Lophospira variablis (FOSSIL) J. Donald, 1902 †
Paupospira varians (FOSSIL) (Billings, 1857 †)
Lophospira ventricosa (FOSSIL) (J.W. Hall, 1847 †)
Loxoplocus vermetus (FOSSIL) (E.F.R.K. Koken, 1897 †)
Paupospira viator (FOSSIL) (J. Perner, 1907 †)
Worthenia whitehorsensis (FOSSIL) F.L. Saunders& E.L. Yochelson, 1964 †
Worthenia windowblindensis (FOSSIL) Batten & A. Stokes,1986 †
Arjamannia woodlandi (FOSSIL) (Longst, 1924 †)
Manzanospira wordensis (FOSSIL) Batten, 1989 †
Worthenia xui (FOSSIL) Yin & E.L. Yochelson,1983 †
Worthenia zardinii (FOSSIL) Yin & E.L. Yochelson,1983 †