This little piece of bone has been found in the Hasle Formation of Bornholm, Denmark

The formation is lower Jurassic (Pliensbachian) of age and contains a rich chondrichthyan fauna, fish, and plesiosaurs. Recently also teeth and bone fragmenst of dinosaurs and a mammal has been found.

The bone piece measures 5 mm in lenght, see picture.

Can anybody help me identify it?

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