Thats not m.heyderii. For starters i see fishhooks.
I propose it to be moved to the generic entry.
Sorry mate

@Baja_Costero thoughts?

I agree, the hooked spines are not a match. But I'm not quite sure what it is. Maybe @mcvansoest might know. Otherwise the genus entry would work perfectly fine.

It is probably M. zeilmanniana.

@Kaktus, I would like to propose moving this image to that entry, if you don't mind.

Thank you Stefan for the eagle eye and Thijs for the most helpful suggestion.

Baja_Costero said:@Kaktus, I would like to propose moving this image to that entry, if you don't mind.

Thank you Stefan for the eagle eye and Thijs for the most helpful suggestion.

Sure , I'll see whether I can move it,... sorry for the confusion, as I started to complete my list of collection, I can only match the similar pictures.. Still have a lot of collection to upload, hope it will not create much problem, tx

Guys,
I do not know how to move the picture to the generic one, can someone tell me what to do ? tx

Done!