The Neognathia birds are Aves whose palatal mobility increased due to the following modifications (Feduccia 1980, 1996):
- Loss of the Basipterygoid articulation with the cranium.
- Development of a Pterygoid/Palatine joint.
- Reduction of the Vomer, such that it does not reach caudally to the pterygoid, or is lost entirely.
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