Production and spectroscopy of heavy flavor and quarkonia with the ATLAS detector

Predictions for the production of quarkonia and open heavy-flavor states at hadronic collider can now be compared to measurements performed at the LHC. ATLAS has measured the production cross section of $J/\psi$ (prompt and non-prompt) and of $\Upsilon(nS)$ (with $n= 1, 2, 3$), together with the inclusive production of b-flavored hadrons. The kinematical ranges covered by the analyses extend up to values of transverse momentum significantly larger than in previous studies. The results are challenging and in some cases marginally compatible with the latest available predictions. Excited B-hadrons and quarkonia states can be detected with the ATLAS detector, opening the possibility of a broader investigation in the field of b-hadron and onia spectroscopy. The latest results, which include the observation of new particles, will be illustrated together with the perspectives for future studies.