This red-toothed shrew, which is as light as a penny, is the first new mammal species from the U.S. state of Arizona since 1977.

Its range extends from Arizona to central portion of the Mexican state of Sonora.

[1] The shrew is found in desert habitats from southeastern and south-central Arizona to central Sonora.

It typically inhabits desert shrub, and plant communities dominated by mesquite, agave, cholla, and oakbrush.

It has a brown-gray color with a reddish-pink nose, tail and feet.