Abludomelita, Genus
Acanthocythereis, Genus
Acanthomysis, Genus
Achaeus, Genus
Acidostoma, Genus
Acrothoracica, Ordo
Aega, Genus
Aegidae, Familia
Aeginella, Genus
Aeginina, Genus
Agathotanaidae, Familia
Agathotanais, Genus
Alcipidae, Familia
Allomelita, Genus
Alpheidae, Familia
Alpheus, Genus
Ampelisca, Genus
Ampeliscidae, Familia
Amphilochidae, Familia
Amphilochoides, Genus
Amphilochus, Genus
Amphipoda, Ordo
Ampithoe, Genus
Ampithoidae, Familia
Anapagurus, Genus
Anarthrura, Genus
Anarthruridae, Familia
Anchialina, Genus
Ancyroniscus, Genus
Anilocra, Genus
Animalia, Regnum
Anonyx, Genus
Anthura, Genus
Anthuridae, Familia
Anthuridea, Subordo
Aora, Genus
Aoridae, Familia
Apherusa, Genus
Apseudes, Genus
Apseudidae, Familia
Apseudomorpha, Subordo
Arcturella, Genus
Arcturidae, Familia
Argissa, Genus
Argissidae, Familia
Aristias, Genus
Armadillidiidae, Familia
Armadillidium, Genus
Arrhis, Genus
Arthropoda, Phylum
Asellota, Subordo
Asellus, Genus
Astacilla, Genus
Atelecyclidae, Familia
Atelecyclus, Genus
Athanas, Genus
Athelges, Genus
Atylus, Genus
Autonoe, Genus
Axiidae, Familia