Acantephyra, Genus
Acanthocyclus, Genus
Acanthonyx, Genus
Actaea, Genus
Aegla, Genus
Aeglidae, Familia
Albuneidae, Familia
Allopetrolisthes, Genus
Alpheidae, Familia
Alpheoidea, Superfamilia
Alpheopsis, Genus
Alpheus, Genus
Animalia, Regnum
Anomura, Infraorder
Aristeidae, Familia
Arthropoda, Phylum
Astacidea, Infraorder
Atelecyclidae, Familia
Atyoidea, Superfamilia
Austropandalus, Genus
Axiidae, Familia