Teinostoma abditum E. Rolán, F. Rubio& P. Ryall, 2000 Ghana
Teinostoma abnorme E.A. Smith, 1890
Tornus abyssicola K.J. Bush, 1897 Galapagos
Pseudoliotia acidalia (J.C. Melvill& R. Standen, 1899) Northern Territory
Circulter acuta C.F. Laseron, 1958
Circulus acutilirata (K.H.J. Thiele, 1925)
Cyclostremiscus adamsi H.A. Pilsbry& A.A. Olsson, 1945 West America
Cochliolepis adamsii (P. Fischer, 1857) Florida Keys
Tornus aemilii E. Rolán & F. Rubio, 2002 Jamaica
Circulus aequatorialis (K.H.J. Thiele, 1925)
Teinostoma africanum E.A. Smith South Africa2 mm
Tornus africanus W. Adam & J. Knudsen,1969 Morocco, cap Cantin2,2 mm
Vitrinella aguayoi (J.X. Corgan, 1968)
Anticlimax aitormonzoi F. Rubio & E. Rolán, 2014 Philippines, Panglao Island2,7 mm
Cyclostremiscus albachiarae I. Perugia, 2015 Philippines, Cebu1,5 mm
Cochliolepis albicerata W.F. Ponder, 1966 New Zealand
Elachorbis albolapis (FOSSIL) C.R. Laws, 1930 †
Cochliolepis alfredensis (P. Bartsch, 1915) Mzamba, Transkei, South Africa1 mm
Solariorbis allomphalus H.A. Pilsbry& A.A. Olsson, 1952 Colombia, Narino Department
Teinostoma altum H.A. Pilsbry, 1953 Florida, St. Augustine1,5 mm
Teinostoma americanum H.A. Pilsbry& A.A. Olsson, 1945 Colombia
Solariorbis ametabolus H.A. Pilsbry& A.A. Olsson, 1952 Peru, Tumbes
Teinostoma amplectans P.P. Carpenter, 1857 Costa Rica, Cocos Island3,7 mm
Teinostoma anastomosis F. Rubio, E. Rolán& Y.C. Lee, 2011
Cyclostremiscus anceps (FOSSIL) (C.R. Laws, 1941 †)
Teinostoma andrium (FOSSIL) W.P. Woodring, 1957 † Panama, Colón
Naricava angasi (A. Adams, 1864) Australia, Port Jackson
Pseudoliotia anglypta (A. Adams, 1863) Japan
Circulus angulata (C.B. Adams)
Naricava angulata (C. Hedley, 1905) Australia, Newcastle
Anticlimax annae H.A. Pilsbry& A.A. Olsson, 1950
Vitrinella anneliesae D. De Jong& H.E. Coomans, 1988 Cuba2 mm
Solariorbis annulatus (P.P. Carpenter, 1857) West America
Vitrinella annulifera (P. Dautzenberg, 1910) Gabon, Cap Esterias
Teinostoma anomala T. Iredale, 1936 Japan