Digitolabrum abedi (FOSSIL) Abbass, 1967 †
Anchura abrupta (FOSSIL) T.A. Conrad, 1860 †
Dicroloma acuminatum (FOSSIL) (L.É.S. Piette, 1856 †)
Dimorphosoma acuta (FOSSIL) (A.V.M.D. D'Orbigny,1843 †)
Protohemichenopus acutecarinata (FOSSIL) (Behrendsen, 1891 †)
Tessarolax acutimarginatus (FOSSIL) (T. Nagao, 1932 †)
Protohemichenopus acutus (FOSSIL) (Behrendsen, 1892 †)
Anchura ainikta (FOSSIL) Elder & Saul, 1996 †
Tessarolax alaskana (FOSSIL) Saul & R.L. Squires,2015 †
Aporrhais alata (FOSSIL) (K.E.I. von Eichwald,1830 †)
Dicroloma album (FOSSIL) (Thurmann, 1861 †)
Alaria alienigena (FOSSIL) W.H. Hudleston, 1888 †
Quadrinervus amoenus (FOSSIL) (L.É.S. Piette, 1856 †)
Lispodesthes amplus (FOSSIL) D.T. Dockery, 1993 †
Alarimella anae (FOSSIL) Saul, 1998 †
Arrhoges analogus (FOSSIL) (G.P. Deshayes, 1865 †)
Quadrinervus anatipes (FOSSIL) (Buvignier, 1852 †)
Chenopus anceps (FOSSIL) C.L.F. von Sandberger,1861 †
Dimorphosoma ancylochila (FOSSIL) J. Gardner, 1875 †
Anchura andersoni (FOSSIL) E.C. Allison, 1955 †
Pietteia anglica (FOSSIL) Cox & Arkell 1950 †
Alaria angulata (FOSSIL) C. Moore, 1866 †
Anchura angulata (FOSSIL) (W.M. Gabb, 1864 †)
Cuphosolenus angulicostata (FOSSIL) (Buvignier, 1852 †)
Tessarolax antarctica (FOSSIL) (L.R. Cox, 1953 †)
Struthiochenopus antarcticus (FOSSIL) Zinsmeister & Griffin,1995 †
Pietteia apenninica (FOSSIL) L.F. Conti & Fischer,1982 †
Aporrhais arabica (FOSSIL) Abbass, 1977 †
Cultrigera arachnoides (FOSSIL) (J. Müller, 1851 †)
Hemichenopus araucanus (FOSSIL) (R.A. Philippi, 1887 †)
Antarctohoges arcuacheilos (FOSSIL) J.D. Stilwell& Zinsmeister, 1992 †
Anchura arenaria (FOSSIL) (Morton, 1834 †)
Alaria arenosa (FOSSIL) W.H. Hudleston, 1884 †
Dicroloma armata (FOSSIL) (P. Morris & J. Lycett,1851 †)
Dicroloma athulia (FOSSIL) (A.V.M.D. D'Orbigny,1850 †)