Architectonica acuta (FOSSIL) T.A. Conrad, 1854 † USA, Mississippi22 mm
Discotectonica acuta (FOSSIL) (J.E. Tenison-Woods,1879 †) Australia, Victoria20 mm
Solatisonax acutecarinata (K.H.J. Thiele, 1925) Philippines, Bohol7,6 mm
Discotectonica acutissima (G.B. III Sowerby, 1914) Philippines, Aliguay Island48 mm
Juliania aequistriata (FOSSIL) (H.F.A. von Ihering,1907 †) Argentina, Santa Cruz26 mm
Juliania aequistriata casamajorensis (FOSSIL) Morra & Del Rio, 1987 † Argentina, Santa Cruz33,5 mm
Architectonica aethiops K.T. Menke, 1830
Architectonica affinis (FOSSIL) Sowerby, 1840 † India, Karikal
Dinaxis alabamense (FOSSIL) (W.H. Dall, 1892 †) Mexico, Chiapas, Chiapa de Corzo
Discotectonica alfi Thach, 2017
Solatisonax alleryi (G. Seguenza, 1876) Italy, Terracina10 mm
Nipteraxis alonzensis (FOSSIL) J.M. Pacaud, 2017 † France
Pseudotorinia aloysii (R. Selli, 1973)
Stellaxis alveatum (FOSSIL) (T.A. Conrad, 1833 †) Colombia, Bolivar
Architectonica ammonites (FOSSIL) J.B.P.A. Lamarck, 1804 † France, Paris Basin6 mm
Architectonica amoena (FOSSIL) T.A. Conrad, 1854 † Alabama
Pseudotorinia amoena (R. Murdoch& H.H. Suter, 1906) Réunion3,6 mm
Rinaldoconchus ampezzanus (FOSSIL) Zardini, 1980 † Italy, St Cassian Formation
Solarium amphitermum (FOSSIL) W.H. Dall, 1892 †
Astronacus anaglyptus (FOSSIL) W.P. Woodring, 1959 † Panama, Colón5 mm
Architectonica angsanana (FOSSIL) (K. Martin, 1922 †) Indonesia, Java
Architectonica angustiforatum (FOSSIL) (A.E.M. Cossmann& M.A. Peyrot, 1921 †) France, Aquitaine8 mm
Disculus antoinei P.M. Pallary, 1936 Morocco, cap Cantin11,62 mm
Architectonica arcana R. Bieler, 1993 Pakistan27,7 mm
Pseudotorinia architae (O.G. Costa, 1841) Spain, Malaga10 mm
Pseudotorinia architae cristallina (G.W. Nowell-Usticke,1969) Florida5,9 mm
Pseudotorinia architae retifera (W.H. Dall, 1892) Western Atlantic
Heliacus areola (J.F. Gmelin, 1791) Philippines, Cebu15 mm
Heliacus areola bicanaliculatus (A. Valenciennes, 1832) Costa Rica19,2 mm
Spirolaxis argonauta R. Bieler, 1993 Taiwan, Pratas Island
Architectonica ariei (FOSSIL) Wienrich & Janssen,2007 † Germany
Pseudotorinia armillata R. Bieler, 1993 Réunion
Architectonica arthuri (FOSSIL) Vasseur, 1881 † France, Brittany8 mm
Pseudomalaxis asculpturatus (FOSSIL) P.A. Maxwell, 1966 † Australia, South Australia, Adelaide
Granosolarium asperum (R.B. Hinds, 1844) South Africa, Natal, Durban Bay15,5 mm