Aaptos, Genus
Acarnus, Genus
Acervochalina, Genus
Adreus, Genus
Aka, Genus
Alectona, Genus
Amphiute, Genus
Amphoriscidae, Familia
Amphoriscus, Genus
Anchinoidae, Familia
Ancorina, Genus
Ancorinidae, Familia
Animalia, Regnum
Antho, Genus
Aphroceras, Genus
Aplysilla, Genus
Aplysina, Genus
Aplysinidae, Familia
Artemisina, Genus
Ascaltis, Genus
Ascandra, Genus
Astrophorida, Ordo
Auletta, Genus
Axinella, Genus
Axinellidae, Familia
Axinyssa, Genus