  In order to test different models proposed for some states discovered
recently in the charmonium mass range that do not fit into the pattern
predicted by the conventional quark model, we derive predictions for the
spectrum within the hadro-charmonium picture, the tetraquark picture as well as
the hadronic molecular approach. We exploit heavy quark spin symmetry for the
hadro-charmonium and hadronic molecule scenarios. The patterns that emerge from
the different models turn out to be quite distinct. For example, only within
the hadro-charmonium picture a pseudoscalar state emerges that is lighter than
the Y(4260). Possible discovery channels of these additional states are
discussed.
