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?