Iberomesornis 
                   

                    The fossil remains of Iberomesornis have been found in lacustrine or lagoonal deposits
                    from the Lower Cretaceous located in Spain.  The wing span of Iberomesornis was 
                    approximately 20 cm in length (about the size of a small finch), and had a toothed beak.
                    It had a short tail with the development of a pygostyle.  Iberomesornis has an intermediate
                    phylogenetic position between Archaeopteryx and Ornithurae due to a combination
                    of primitive and derived characters (Sanz and Bonaparte 1992).  Primitive characters
                    include the structure of the pelvis and hindlimb which is similar to that of Archaeopteryx.
                    The derived characters common in modern birds include feathers, coracoid, furcula and
                    pygostyle.  It is thought to be a true bird with the capability of powered flight.