The flat-headed pika is recorded from the Longmen Mountains in Sichuan, China. Its original description gives sandy-yellow dorsal fur and a yellow-white underside. A 2026 analysis reports a strict association with dark coniferous forest for all four assessed Alienauroa species, including this one.
The original species description gives a sandy-yellow back and a yellow-white underside.
A 2026 analysis of all specimens available for subgenus Alienauroa recognizes O. flatcalvariam among four species and reports that all four are strictly associated with dark coniferous forests.
An extinction-risk assessment has not been added yet.