Postcranially Dilong paradoxus has proportionally a longer neck and trunk. The opisthocoelous cervical vertebrae have low neural spines and large pneumatic openings on relatively shallow centra (Fig.

The bones, especially the vertebrae, exhibit several distinct features including amphicoelous to slightly opisthocoelous vertebral shapes, which mark a divergence from more derived species within ...

The central portions of the vertebrae were distinguished by having a concave, cup-shaped surface on the back end, which led Cope to attribute them to an “opisthocoelous” dinosaur similar to ...