Cardiocardita tankervillii (W. Wood, 1828) Senegal, Dakar48 mm
Glans tasmanica (FOSSIL) R. Tate, 1886 † Tasmania
Carditamera tegea (FOSSIL) W.H. Dall, 1903 † Panama, Panamá, Arraiján
Pleuromeris tellia (FOSSIL) W.H. Dall, 1903 † United States, Florida, Calhoun
Cardita tercostata (FOSSIL) Berezovsky † Ukraine27 mm
Cyclocardia terryi (FOSSIL) A.A. Olsson, 1922 † Colombia, La Chorrera
Venericardia thalassoplekta (FOSSIL) C.J. Maury, 1912 † Trinidad and Tobago, Siparia
Venericardia thaleia (FOSSIL) C.J. Maury, 1924 † Brazil, Rio Pirabas
Cyclocardia thouarsii (A.V.M.D. D'Orbigny,1845)
Purpurocardia titirangiensis (FOSSIL) (J. Marwick, 1943 †)
Cyclocardia tjuschevkensis (FOSSIL) (Ilyina, 1963 †) Western Kamchatka
Venericardia tokudai (FOSSIL) H. Takeda, 1953 † Japan, Hokkaido, Obira
Cyclocardia tokunagai (FOSSIL) (M. Yokoyama, 1924 †) Japan, Saitama, Ogano
Carditellopsis toneana (M. Yokoyama, 1922) Japan, Iwate
Venericor tonosiensis (FOSSIL) (Rustch, 1936 †) Panama, Los Santos
Pleuromeris tortidens (FOSSIL) G.F. Harris, 1919 † USA, Alabama, Monroe
Venericardia tortidens (FOSSIL) † USA, Alabama, Monroe
Cardita tournoueri (FOSSIL) C. Mayer, 1871 † France, Aquitaine31 mm
Cardita transitoria (FOSSIL) A.E.M. Cossmann& G. Pissarro † France, Normandy8 mm
Claibornicardia trapaquara (FOSSIL) (G.F. Harris, 1895 †) USA, Alabama, Covington
Glans trapezia (C. Linnaeus, 1767) Malta12 mm
Cyclocardia trentensis (FOSSIL) Ward, 1992 † USA, North Carolina, Onslow
Pleuromeris tridentata (T. Say, 1826) Bahamas5 mm
Cardita tridentata (FOSSIL) F.S. Holmes, 1860 † Florida6 mm
Cardita trigonalis (FOSSIL) R. Tate, 1886 †
Venericardia trinidadensis (FOSSIL) C.J. Maury, 1925 † Colombia, Bolivar
Cardita triparticostata (FOSSIL) R.B. Newton, 1922 † Nigeria13 mm
Megacardita turgida (J.B.P.A. Lamarck, 1819) Philippines, Aliguay Island30 mm
Cardita turonica (FOSSIL) P.L.J. Ivolas& M.A. Peyrot, 1900 † Hungary, Közép-Dunántúl11 mm
Pleuromeris ultima R.K. Dell, 1956 New Zealand
Cardites umbonatus (G.B. III Sowerby, 1904) Guinea14 mm
Cyclocardia umnaka (G. Willett, 1932) America
Cardita unica (FOSSIL) B.F. Kensley & Pether,1986 † South Africa, Western Cape, City of Cape Town
Coripia unidentata (FOSSIL) (B. de Basterot, 1825 †)
Cardita upwarensis (FOSSIL) Woods, 1906 † UK, Cambridgeshire