Plesiocystiscus abbotti (D. De Jong& H.E. Coomans, 1988)
Gibberula ablita (C.F. Laseron, 1957)
Gibberula abyssicola É.A.A. Locard, 1897 Italy, Anzio2,8 mm
Persicula accola (B. Roth & E.V. Coan,1968) Costa Rica, Cocos Island19 mm
Gibberula achenea (B. Roth & E.V. Coan,1971) Costa Rica, Cocos Island
Gibberula acutispira (FOSSIL) A.E.M. Cossmann, 1889 † France, Paris Basin
Gibberula adzubae J.A. Ortea, 2015
Gibberula aequatorialis (K.H.J. Thiele, 1925)
Gibberula agapeta (R.B. Watson, 1886) Australia, Twofold Bay6 mm
Gibberula agricola M.J. Faber, 2005 South Australia2 mm
Persicula albomaculata (W.L. May, 1911) Australia
Cystiscus alborubidus (K.H. Barnard, 1969) South Africa2,1 mm
Gibberula albotriangularis E. Rolán & F. Fernandes,1997 Ghana1,5 mm
Osvaldoginella alejandrae J. Espinosa & J.A. Ortea,2014 Cuba
Plesiocystiscus alfiopivai J. Espinosa & J.A. Ortea,2002 Costa Rica, Manzanillo1,9 mm
Plesiocystiscus alfredensis (P. Bartsch, 1915) South Africa, Kommetjie2,1 mm
Crithe algoensis (E.A. Smith, 1901) South Africa, Algoa Bay4,1 mm
Gibberula almadiensis M. Pin & F. Boyer, 1995 Senegal, Dakar5 mm
Gibberula almo (P. Bartsch, 1915) South Africa, Natal, Durban Bay3,2 mm
Cystiscus alternans (G.B. Pritchard& J.H. Gatliff, 1899) Australia, Bass Strait2 mm
Persicula amplior (FOSSIL) Roth, 1973 † Florida, Alum Bluff formation
Cystiscus angasi (J.C.H. Crosse, 1870) Australia, Port Jackson2 mm
Persicula angystoma (FOSSIL) G.P. Deshayes, 1835 † France, Paris Basin9 mm
Gibberula aperta T. McCleery, 2008 Curaçao Island1,58 mm
Cystiscus aphanacme (J.R. le B. Tomlin, 1918)
Plesiocystiscus aphanospira (J.R. le B. Tomlin, 1913) South Africa, Gordons Bay3,1 mm
Gibberula aquitanensis (FOSSIL) P. Lozouet, 1998 † France, Aquitaine, Landes
Gibberula ardovinii T. Cossignani, 2006 Western Sahara2,4 mm
Gibberula arubagrandis T. McCleery, 2008 Netherlands Antilles, Aruba3,3 mm
Gibberula asellina (F.P. Jousseaume, 1875) Mauritius4,7 mm
Gibberula atlantidea (J. Knudsen, 1956)
Crithe atomaria A.A. Gould, 1860
Plesiocystiscus atomus (E.A. Smith, 1890)
Canalispira attentia (C.F. Laseron, 1957) Queensland
Fulgerca attenuata (FOSSIL) (B. Wade, 1926 †) Tennessee, McNairy County