At first, I didn't see any hooked spines, but now, after having taken off my glasses and looking very closely, I can indeed see 2 hooked centrals. That makes it very unlikely that it is an Escobaria. The flowers will prove for sure that it is something close to M. mazatlanensis (it should flower from the sides, whereas an escobaria has flowers in the top). Maurillio, I just saw your photos of M. gueldemanniana, and it looks very similar to this cactus.
Wolter.