Acalitus ferrugineum 
Aceria fraxini 
Aceria trinema 
Aceria triplacis 
Adanson's House Jumper 
Adelaide trapdoor spider 
Adoxotoma nodosa 
Aelurillus v-insignitus 
Agelenopsis naevia 
Aglaoctenus lagotis 
Agroeca brunnea 
Alopecosa kochi 
Alpaida bicornuta 
Amaurobius simlis 
Amazon Ribbed Tarantula 
Amblyomma cajennense 
American dog tick 
American House Spider 
American Nursery Web Spider 
Amyciaea lineatipes 
Ananteris platnicki 
Anarrhotus fossulatus 
Anasaitis canosa 
Anelasmocephalus cambridgei