Acamarians
Akritiri
Aksani
Alcyones
Aldeans
Aldebarran Serpent
Algorian Mammoth
Allasomorph
Alvanian Cave Sloth
Alvanian Spine Mite
Alverian Dung Beetle
Andarians
Antarians
Amoeba
Amphibian
Anaphasic life form
Andorian Amoeba
Andorians
Angosians
Antideans
Anticans
Apollo
Arachnid
Arbazan
Arbazon Vulture
Arcadian
Arcturian
Argellians
Argosian
Argrathi
Arkarian Water Fowl
Arkenite
Armus
Arritheans
Altarian marsupial
Axanar
Australopithecine
Al-Leyan
Algolians
Alsaurians
Altorans
Aaamazzarites
Akaali
Angelian
Atrean
Antaran
Aenar