Arctornis rutila 
Arctornis tortricoides 
Arctostaphylos nevadensis 
Arcyptera fusca 
Arcyria cinerea 
Arcyria ferruginea 
Arcyria incarnata 
Arcyria insignis 
Arcyria stipata 
Ardeadoris cruenta 
Ardisia rosea 
Ardonea tenebrosa 
Ardys Crescent 
Areas galactina 
Areca palm 
Arenaria cassia 
Arenaria deflexa 
Arenaria libanotica 
arenaria montana 
Arenaria serpyllifolia 
Arenocoris waltlii 
Areolate grouper 
Areolate Woodwasp 
Aretaon asperimus