Riddle, B. R., Jezkova, T., Eckstut, M. E., Oláh-Hemmings, V., & Carraway, L. N. (2014). Cryptic divergence and revised species taxonomy within the Great Basin pocket mouse, Perognathus parvus (Peale, 1848), species group. Journal of Mammalogy, 95(1), 9-25.
In 2014 P. parvus was split by Riddle et al. Utah contains the range of P. mollipilosus.