Torquesia abbassi (FOSSIL) Awad & Abed, 1967 †
Turritella abbatis (FOSSIL) E.A.L. Kittl, 1892 †
Turritella abrupta (FOSSIL) E.M. Spieker, 1922 †
Tropicolpus abscisus (FOSSIL) (H.H. Suter, 1971 †)
Turritella acanthophora Müller 1851
Colpospira accisa (Watson, 1881)
Colpospira acinella (FOSSIL) A.C. Chapman & I. Crespin,1928 †
Bactrospira acosta (FOSSIL) A.A. Olsson, 1964 †
Gazameda acricula (FOSSIL) (R. Tate, 1893 †)
Turritella acropora W.H. Dall, 1889
Turritella acuta (FOSSIL) C. Mayer, 1858 †
Turritella acuticarinata R.W. Dunker, 1847
Turritella adelaidensis (FOSSIL) B.C. Cotton & Woods,1935 †
Spirocolpus adingae (FOSSIL) (R. Tate, 1883 †)
Turritella adulterata (FOSSIL) (G.P. Deshayes, 1861 †)
Turritella aequistriata (FOSSIL) T.A. Conrad, 1863 †
Mariacolpus aequistriatus (FOSSIL) (T.A. Conrad, 1863 †)
Turritella affinis (FOSSIL) Muller, 1849 †
Turritella ageri (FOSSIL) Abbass, 1962 †
Turritella aguilerae (FOSSIL) Bose, 1906 †
Stiracolpus ahiparanus (A.W.B. Powell, 1927)
Torquesia akkadi (FOSSIL) Awad & Abed, 1967 †
Mesalia alabamiensis (FOSSIL) A. De Gregorio, 1890 †
Turritella alba H. Adams, 1872
Turritella albolapis (FOSSIL) Finlay, 1924 †
Turritella alcida (FOSSIL) W.H. Dall, 1898 †
Turritella algida J.C. Melvill & R. Standen,1912
Wyattella allisoni (FOSSIL) O.S. Adegoke, 1967 †
Turritella altavillensis (FOSSIL) A.E.M. Cossmann & G. Pissarro †,
Turritella alticostata (FOSSIL) T.A. Conrad, 1834 †
Bactrospira altilira (FOSSIL) (T.A. Conrad, 1857 †)
Bactrospira altilira chiriquiensis (FOSSIL) (A.A. Olsson, 1922 †)
Bactrospira altilira praecellens (FOSSIL) (H.A. Pilsbry & J. Brown,1917 †)
Bactrospira altilira tornata (FOSSIL) (R.J.L. Guppy, 1917 †)
Turritella altilirata (FOSSIL) Grzybowski, 1899 †