Acalitus ferrugineum 
Aceria fraxini 
Aceria trinema 
Aceria triplacis 
Actinacantha 
Aculus leionotus 
Acusilas malaccensis 
Adanson's House Jumper 
Adelaide trapdoor spider 
Adoxotoma nodosa 
Aelurillus v-insignitus 
Agelena labyrithica 
Agelenopsis naevia 
Aglaoctenus lagotis 
Agroeca brunnea 
Alder Leaf Gall Mite 
Allocosa funerea 
Allocosa subparva 
Alopecosa kochi 
Alpaida bicornuta 
Amaurobius simlis 
Amazon Ribbed Tarantula 
Amazon Thorn Spider 
Ambicodamus crinitus