Oeneis tanana

Oeneis tanana is a species of butterfly, a member of the Satyrinae.

It occurs in Alaska, and is believed to be the only endemic species of butterfly in the state.

[1] It occurs only in the Tanana River valley area of Alaska.

This valley, or part of it, was a glacial refugium during the last ice age.

O. tanana inhabits clearings in boreal spruce forests.