Aristaria nigrifrons 
Aristobia horridula 
Aristotelia pudibundella 
Aristotle's Duke 
Arizona bark scorpion 
Arizona Bird-dropping Moth 
Arizona Tan Mantis 
Arkys transversus 
Armadillidium granulatum 
Armed Spiny Ant 
Armigeres subalbatus 
Armored Stink Beetle 
Army cutworm 
Armyworm Parasitoid Wasp 
Arna bipunctapex 
Arnobia pilipes 
Arnobia trichopus 
Arocera apta 
Arocera spectabilis 
Arotes amoenus 
Arrade destituta 
Arrade leucocosmalis 
Arran brown 
Arrhopalites aggtelekiensis