To my knowlege they are ALL now S.s.semiannulata as it is now considered monotypic. At least all the Az. subspecies(semiannulata, isozona and gloydi)are now considered synonyms. Shasheena's snakes would be what was once considered isozona. But yes, what was once considered nominate semiannulata was known from only a handfull of specimens which were all banded with a rather low band count.