1. Fenestra that has the base of the stapes attached to it
   - fenestra ovalis, fenestra vestibuli, oval window

Type of: fenestra

• genus Andryala
• genus Aneides
• genus Anemia
• genus Anemone
• genus Anemonella
• genus Anemopsis
• genus Anethum
• genus Angelica
• genus Angiopteris
• genus Angraecum
• genus Angrecum
• genus Anguilla
• genus Anguillula
• genus Anguis
• genus Anhima
• genus Anhinga
• genus Anigozanthus
• genus Anisotremus
• genus Ankylosaurus
• genus Annona
• genus Anoa
• genus Anodonta
• genus Anoectochilus
• genus Anogramma
• genus Anolis