Acinophorus Tryon, 1884 (original description)
Actinoptera Tryon, 1884 † accepted as Actinopteria Hall, 1883 † (original description)
Actinostrea Tryon, 1884 † accepted as Actinostreon Bayle, 1878 † (original description)
Anthonia Tryon, 1884 † accepted as Anthonya Gabb, 1864 † (original description)
Apastus Tryon, 1884 accepted as Aspastus Albers, 1850 (original description)
Aphania Tryon, 1884 † accepted as Aphanaia Koninck, 1878 † (original description)
Aulocomya Tryon, 1884 † (original description)
Autenoe Tryon, 1884 accepted as Autonoe Guppy, 1868 accepted as Ellobium Röding, 1798 (original description)
Calcara Tryon, 1884 (original description)