It is a notably narrow skull mice mouse, a trait that gives it its name and that distinguishes it morphologically from the rest of the same genus related species present in northwestern Mexico. It lives in dry drizzle and dry tropical forest of a fraction of the Mexican Pacific, where it shares habitat with other species of mice mice from which it differs mainly by cranial details difficult to appreciate without capture. Like the rest of its genre, it stores seed in external bags covered with hair on both sides of the mouth, and spends the day underground to avoid extreme desert heat.
Small rodent, gray brown fur, noticeably narrower skull compared to other related species, and long tail with terminal mouse. It differs from other species of Bayon mouse in its area mainly by that narrower skull, a feature that in practice requires capture and measurement to confirm.
Small footprint with lengthy rear legs, 1.5-2 cm, with coupled jump marks typical of desert biped rodents. Small and lengthy feces, 4-6 mm, left dispersed near the strawberry. Excavate simple strawberries in loose soil, with the entrance often covered during the day.
Matorral arid and dry tropical forest, from low lands to medium cotes.
Granivorous, it feeds mainly on seeds, complemented with succulent vegetation and occasional insect.
Solitary and strictly nocturnal, it remains in its nursery during the hours of daytime heat.
Its populations are considered stable in most of its area of distribution.
It does not face significant threats at species level; locally suffers habitat loss due to agricultural expansion.
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