Mammillaria ID

Hello!
My friends from Brazil and I am needing help in the identification of Mammillaria someone could help me very much.
Regards Cris

https://i.servimg.com/u/f85/14/15/03/88/mammil16.jpg

HI,
I think I can see 1 short central and maybe 6-8 radial spines, also short. Is this right? A close-up photo of flower and spines would help.
My first thought was of of the pink flowered form of M. sempervivi, now called pseudocrucigera, but I am not sure at all. How big is the plant?

Hello!
Chris!
I can not picture a better the plant is still very small only six cemtimetros or three-inch short central and maybe 6-9 radial spines.

Thank you for your help.
Regards Cris

Hello Cris,

At first a very warm welcome to this Forum. I hope you find everything you need here.
About your plant: I follow Chris with his ID , mammillaria pseudocrucigera it is.

Thank you!
Yes, this forum is wonderful, it has helped me a lot, but my English not, Thank you to identify the time I am looking very much.
Regards Cris

Hello!It would be a Mammillaria? Do not get your ID.

Thank you!Regards Cris

I am not to sure about this put I think it could be a Coryphantha. It seems to have a groved tubercle. I could not say which species this is has I only grow Mamm's.

Hi Cris,
Are these three photos of the same plant?
I can't see enough of the yellow flowered plant to identify it fully. I need to see more of the body of the plant.
The other two photos appear to be of Coryphantha species to me, but I am not sure which one(s).

Hello!
Chris!
Yes, they are the same plant.
Regards Cris

To me, the first picture looks more like M. sartorii. With its angled tubercles and darker midstrip petals. Bristles may or may not be present as in this case. M. sempervivi (or pseudocrucigera) has smaller, more compact tubecles.

The yellow flower plant is definitely Coryphantha . Grooves can be seen even on the first picture on the lower tubercles. Extrafloral nectary glands can be seen in the axils in subsequent pictures. I do not know which species though.

https://servimg.com/view/14150388/24
https://i.servimg.com/u/f65/14/15/03/88/ogaaah10.jpg
https://i.servimg.com/u/f65/14/15/03/88/ogaaai10.jpg

Hello!
I wonder if anyone can help me
with the ID of Mammillaria.
The three pictures are the same plant!
Regards Cris Brazil

Good evening. Beautiful specimen.
To me it looks like Mammillaria heyderi .. (for the ssp .. too dificult for me ..)
But better wait for other opinions (far more knowledgeable than me).

Thank you!