This deer mouse is known only from Tortuga Island, Mexico. Its tail is distinctly shorter than its head and body, while field records are scarce.
It has a relatively large body and a tail clearly shorter than the head and body. The upper coat is dusky with pinkish-cinnamon tones, the underside is white, and the tail is two-toned.
Reproductive records are sparse: one pregnant, lactating female was collected in October, while May specimens showed no reproductive activity. An old field note also records four young taken from a nest beneath a rock.
An extinction-risk assessment has not been added yet.