Abandoned-web orb-weaver 
Acalitus ferrugineum 
Aceria caulis 
Aceria cephalanthi 
Aceria fraxini 
Adanson's House Jumper 
Adelaide trapdoor spider 
Adoxotoma nodosa 
Aelurillus v-insignitus 
Agalenatea redii 
Agelena labyrinthica 
Agelenopsis naevia 
Agroeca brunnea 
Alopecosa kochi 
Alpaida bicornuta 
Amaurobius simlis 
Amblyomma cajennense 
American dog tick 
American House Spider 
American Nursery Web Spider 
Amyciaea lineatipes 
Ananteris platnicki 
Anasaitis canosa 
Anelasmocephalus cambridgei