Acrosternum rubescens 
Acrotaphus wiltii 
Acrotomia mucia 
Acrotomodes lindae 
Acrotylus longipes 
Acrozoanthus 
Actaeon beetle 
Actias philippinica 
Actinacantha 
Actinonotus pulcher 
Actinote anteas 
Actinote stratonice 
Actinote tenebrosa 
Actinotia radiosa 
Aculus leionotus 
Acupalpus testaceus 
Acusilas malaccensis 
Acute Point Moth 
Acyphas chionitis 
Acyrthosiphon kondoi 
Ada's planarian 
Adalia conglomerata 
Adams gem 
Adamsia palliata