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