We investigate heavy quark symmetries for heavy light meson-antimeson systems in a contact-range effective field theory. In the SU(3) light flavor limit, the leading order Lagrangian respecting heavy quark spin symmetry contains four independent counter-terms. Neglecting 1/m (Q) corrections, three of these low energy constants can be determined by theorizing a molecular description of the X(3872) and Z (b) (10610) states. Thus, we can predict new hadronic molecules, in particular the isovector charmonium partners of the Z (b) (10610) and the Z (b) (10650) states. We also discuss hadron molecules composed of a heavy meson and a doubly-heavy baryon, which would be related to the heavy meson-antimeson molecules thanks to the heavy antiquark-diquark symmetry. Finally, we also study the decay, which is not only sensitive to the short distance part of the X(3872) molecular wave function, as the J/psi pi pi and J/psi 3 pi X(3872) decay modes are, but it is also affected by the long-distance structure of the resonance. Furthermore, this decay might provide some information on the interaction between the charm mesons.