So far, the only distinct species of Archaeopteryx other than A. lithographica that is nearly universally considered valid. This is based on the holotype, BSP I 1999. In discussions of the anatomy, Wellnhofer and others mention a sternum, but recent work indicates this is part of the coracoid, so there was no keel, no sternum broader than long, etc. A. bavarica is distinguished from A. lithographica on the basis of a longer hindlimb compared to the humerus, and a longer tiba than the femur, so for the most part it's distinguished by really long legs, which has led some to suspect it as a juvenile trait; Wellnhofer also considered the sternum as diagnostic, but this is clearly not so (as it stands now, no Archaeopteryx specimen has an ossified sternum preserved, and none may have had one at all).