Carychium achimszulci (FOSSIL) Stworzewicz, 1999 †
Microtralia acteocinoides J.T. Kuroda & T. Habe,1961
Pythia acuta J.B. Hombron& C.H. Jacquinot, 1847
Marinula acuta (A.V.M.D. D'Orbigny,1835)
Melampus adamsianus L. Pfeiffer, 1855
Ovatella aequalis (R.T. Lowe, 1832)
Pedipes affinis (A.E.J. Férussac, 1821)
Microtralia alba (J. Gassies, 1865)
Pythia albovaricosa L. Pfeiffer, 1853
Ovatella aldingae (R. Tate, 1878)
Zospeum alpestre (C. Freyer, 1855)
Microtralia ambigua W.H. Turton, 1932
Zospeum amoenum (G.R. von Frauenfeld,1856)
Laemodonta amplicata C.F. Jickeli, 1874
Cassidula angulata R.E. Petit
Pedipes angulatus C.B. Adams, 1852
Cassidula angulifera (S.A.A. Petit De La Saussaye, 1841)
Pythia anhi Thach, 2016
Carychium antiquum (FOSSIL) A. Braun, 1851 †
Ellobium auricula (J.G. Bruguière, 1792)
Cassidula aurisfelis (J.G. Bruguière, 1789)
Ellobium aurisjudae (C. Linnaeus, 1758)
Ellobium aurismidae (C. Linnaeus, 1758)
Ophicardelus australis H.H. Beck, 1838
Pythiopsis auversiensis (FOSSIL) A.E.M. Cossmann, 1889 †
Leopoldium balatonicum (FOSSIL) (L. von G. Tausch,1886 †)
Carychium belizeense Jochum & Weigand, 2017
Laemodonta bella (H. Adams & A. Adams,1855)
Zospeum bellesi E. Gittenberger, 1973
Carychium berellense (FOSSIL) De Laubrière & Carez,1881 †
Carychium bermudense (FOSSIL) Gulick, 1904 †
Carychium berthae (FOSSIL) (Halaváts, 1903) †
Auriculinella bidentata (G. Montagu, 1808)
Melampus bidentatus T. Say, 1822
Carychiopsis bigeminata (FOSSIL) (Deshayes, 1863) †