Plesiocystiscus abbotti (D. De Jong & H.E. Coomans,1988)
Gibberula ablita (C.F. Laseron, 1957)
Gibberula abyssicola É.A.A. Locard, 1897
Persicula accola (B. Roth & E.V. Coan,1968)
Gibberula achenea (B. Roth & E.V. Coan,1971)
Gibberula acutispira (FOSSIL) A.E.M. Cossmann, 1889 †
Gibberula adzubae J.A. Ortea, 2015
Gibberula aequatorialis (K.H.J. Thiele, 1925)
Gibberula agapeta (R.B. Watson, 1886)
Gibberula agricola M.J. Faber, 2005
Persicula albomaculata (W.L. May, 1911)
Cystiscus alborubidus (K.H. Barnard, 1969)
Gibberula albotriangularis E. Rolán & F. Fernandes,1997
Osvaldoginella alejandrae J. Espinosa & J.A. Ortea,2014
Plesiocystiscus alfiopivai J. Espinosa & J.A. Ortea,2002
Plesiocystiscus alfredensis (P. Bartsch, 1915)
Crithe algoensis (E.A. Smith, 1901)
Gibberula almadiensis M. Pin & F. Boyer, 1995
Gibberula almo (P. Bartsch, 1915)
Cystiscus alternans (G.B. Pritchard& J.H. Gatliff, 1899)
Persicula amplior (FOSSIL) Roth, 1973 †
Cystiscus angasi (J.C.H. Crosse, 1870)
Persicula angystoma (FOSSIL) G.P. Deshayes, 1835 †
Gibberula aperta T. McCleery, 2008
Cystiscus aphanacme (J.R. le B. Tomlin, 1918)
Plesiocystiscus aphanospira (J.R. le B. Tomlin, 1913)
Gibberula aquitanensis (FOSSIL) P. Lozouet, 1998 †
Gibberula ardovinii T. Cossignani, 2006
Gibberula arubagrandis T. McCleery, 2008
Gibberula asellina (F.P. Jousseaume, 1875)
Gibberula atlantidea (J. Knudsen, 1956)
Crithe atomaria A.A. Gould, 1860
Plesiocystiscus atomus (E.A. Smith, 1890)
Canalispira attentia (C.F. Laseron, 1957)
Fulgerca attenuata (FOSSIL) (B. Wade, 1926 †)