The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
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- Abantiades (1 member)
- Abax (2 members)
- Acari (16 members)
- Actions (1 member)
- Adephaga (15 members)
- Agaonidae (3 members)
- Agestrata (1 member)
- Agra (2 members)
- Allotopus (1 member)
- Amaurodes (1 member)
- Amblypygi (4 members)
- Ammotrechidae (3 members)
- AnatomyPhysiology (26 members)
- Anatomy stubs (1 member)
- Anisolabididae (1 member)
- Anisorrhina (1 member)
- Annelids (1 member)
- Anobiidae (6 members)
- Anoplura (1 member)
- Ants (6 members)
- Aphanichroa (1 member)
- Aphididae family (3 members)
- Apidae (5 members)
- Apinae (3 members)
- Apini (1 member)
- Apis (1 member)
- Apis (genus) (6 members)
- Apocrita (4 members)
- Apoidea (4 members)
- Arachnid families (6 members)
- Arachnids (31 members)
- Araneae (26 members)
- Archaeognatha (1 member)
- Archaeognatha images (2 members)
- Arctiinae (2 members)
- Argasidae (2 members)
- Argyronetidae (2 members)
- Arixeniidae (2 members)
- Arixeniina (1 member)
- Arthropod types (12 members)
- Arthropoda (0 members)
- Article management templates (4 members)
- Article shortboxes (11 members)
- Article stubs (220 members)
- Ascalaphidae (1 member)
- Auchenorrhyncha (3 members)
- Bees (12 members)
- Bees & Wasps (0 members)
- Beetles (34 members)