Acalitus ferrugineum 
Aceria fraxini 
Aceria trinema 
Aceria triplacis 
Actinacantha 
Adanson's House Jumper 
Adelaide trapdoor spider 
Adoxotoma nodosa 
Aelurillus v-insignitus 
Agelena labyrithica 
Agelenopsis naevia 
Aglaoctenus lagotis 
Agroeca brunnea 
Alopecosa kochi 
Alpaida bicornuta 
Amaurobius simlis 
Amazon Ribbed Tarantula 
Ambicodamus crinitus 
Amblyomma cajennense 
Amblyomma tholloni 
American dog tick 
American House Spider 
American Nursery Web Spider 
Amyciaea lineatipes