Notarium

Source: Wikipedia, the free encyclopedia.
Skeleton of a mounted Pteranodon, showing the notarium between the shoulder blades

Notarium or os dorsale is a bone consisting of the fused

pterosaurs the notarium articulates with the scapula. This joint is unique among tetrapods, as in no other taxa is there a direct connection between the pectoral girdle and vertebral column (though in species with clavicles
, the clavicle articulates with the sternum, which in turn is connected to the vertebrae via the ribs, allowing an indirect connection).

Among birds, notarium is found among

Steatornithidae. It contains 2-6 vertebrae. It probably evolved at least 10 times independently in birds.[1]

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