Arkys transversus 
Armadillidium granulatum 
Armed Spiny Ant 
Armigeres subalbatus 
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 
Arrhythmus rugosipennis 
Arrow Crab 
Arrow Sphinx 
Arrow-shaped Orbweaver 
Arrowhead crab 
Arrowhead spider 
Arsenura armida 
Arsenura batesii