Boreiohydrias is an extinct genus of marine polymixiiform ray-finned fish, related to modern beardfish, that lived during the Turonian stage of the Late Cretaceous epoch. It is the only member of the family Boreiohydriidae.

Distribution

Boreiohydrias dayi is known from the shore of Lac des Bois in the Northwest Territories, Canada, in Turonian-aged sediments deposited in the aftermath of the Cenomanian-Turonian boundary event. This locality represents an open-water environment on the northern edge of the Western Interior Seaway, and is potentially correlated with the Cenomanian and Turonian-aged Slater River Formation.