I just got two new ones to my collection. Very small right now. A nice light yellow one that is noID. So we call it H. Yellow. and H. zebrina.
The closest we can come up with is Huernia 'Stretched Hide' ISI 2013-23 which is a hybrid of H. thuretii var. primulina. Just guessing. Can't find anything else close. So it is a hybrid of something.