- A1
- A2
- A3
- acicular
- aciculate
- acron
- acuminate
- adecticous
- adfrontal
- adfrontal suture
- aedeagus
- Afrotropical
- alar
- alimentary canal
- anal
- anal fork
- anastomosing
- androconial
- anellus
- annulate
- anteclypeus
- anterior
- antrum
- apex
- apical
- apomorphy
- apophyses anteriores
- apophyses posteriores
- apterous
- arcuate
- atrophied
- autapomorphy
- axillaries
- axillary plate