Cardiocardita tankervillii (W. Wood, 1828)
Glans tasmanica (FOSSIL) R. Tate, 1886 †
Carditamera tegea (FOSSIL) W.H. Dall, 1903 †
Pleuromeris tellia (FOSSIL) W.H. Dall, 1903 †
Cardita tercostata (FOSSIL) Berezovsky †
Cyclocardia terryi (FOSSIL) A.A. Olsson, 1922 †
Venericardia thalassoplekta (FOSSIL) C.J. Maury, 1912 †
Venericardia thaleia (FOSSIL) C.J. Maury, 1924 †
Cyclocardia thouarsii (A.V.M.D. D'Orbigny,1845)
Purpurocardia titirangiensis (FOSSIL) (J. Marwick, 1943 †)
Cyclocardia tjuschevkensis (FOSSIL) (Ilyina, 1963 †)
Venericardia tokudai (FOSSIL) H. Takeda, 1953 †
Cyclocardia tokunagai (FOSSIL) (M. Yokoyama, 1924 †)
Carditellopsis toneana (M. Yokoyama, 1922)
Venericor tonosiensis (FOSSIL) (Rustch, 1936 †)
Pleuromeris tortidens (FOSSIL) G.F. Harris, 1919 †
Venericardia tortidens (FOSSIL) †
Cardita tournoueri (FOSSIL) C. Mayer, 1871 †
Cardita transitoria (FOSSIL) A.E.M. Cossmann & G. Pissarro †,
Claibornicardia trapaquara (FOSSIL) (G.F. Harris, 1895 †)
Glans trapezia (C. Linnaeus, 1767)
Cyclocardia trentensis (FOSSIL) Ward, 1992 †
Pleuromeris tridentata (T. Say, 1826)
Cardita tridentata (FOSSIL) F.S. Holmes, 1860 †
Cardita trigonalis (FOSSIL) R. Tate, 1886 †
Venericardia trinidadensis (FOSSIL) C.J. Maury, 1925 †
Cardita triparticostata (FOSSIL) R.B. Newton, 1922 †
Megacardita turgida (J.B.P.A. Lamarck, 1819)
Cardita turonica (FOSSIL) P.L.J. Ivolas& M.A. Peyrot, 1900 †
Pleuromeris ultima R.K. Dell, 1956
Cardites umbonatus (G.B. III Sowerby, 1904)
Cyclocardia umnaka (G. Willett, 1932)
Cardita unica (FOSSIL) B.F. Kensley & Pether,1986 †
Coripia unidentata (FOSSIL) (B. de Basterot, 1825 †)
Cardita upwarensis (FOSSIL) Woods, 1906 †