Hello all, I am not familiar with all the cacti genera and species. This one I picked up a few years ago at a local nursery. Typical of nursery plants, it was labeled as "cacti and succulents". As one can see, it is a small, low-growing, spreading species. The new spines have a deep red coloration, then turn white with age. The flower is small, creamy-yellow, with red stripes. It is in a small bonsai dish (4 inches x 6 inches)/(10 cm x 15 cm). Since it was found at a local nursery, I would suspect that it is common in cultivation, but I have yet to see a photo of anything similar that I could use for an identification.