Blooming beauty for ID

This one teasing me some time... I waited for blooming and here he is:
About 18 radial spines, four central with lowermost hooked...
And nice flower, pretty big for his size

Help please

Mammillaria duoformis or something in the M.duoformis complex  could be a correct suggestion

It looks like M. duoformis var. Xuchiapensis in the Reppenhagen mammillaria book.

Yes it looks correct  Thank's everybody!!!

This is one of my M. duoformis var. xuchiapensis. This one seems to have come out with straight spines, though another from the same seed, but not in flower has one hooked spine.

I find it difficult to distinguish this from M. duoformis, which is quite a variable species, I have found. The description in Reppenhagens's book calls for just 2 central spines, but his photo shows a plant which certainly looks like it has 4. I suspect that he found a plant that he thought different, but ignored the intrinsic variability of the species. The type location for M. duoformis, Tehuitzingo, Puebla, is less that 30kms from the type location of Reppenhagen's var. xuchiapensis, and in the same range of hills.

I think that this varietal name is best ignored, and I'm happy just to call your plant M. duoformis





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Here is another more "artistic" and less "identifying" picture  
Interesting thing is that I bought this one last year for a 1,5EUR  I thought that this one is a little bit different from some "industrial" Zeilmannianas which are commonly sold. And I was right