The genus contains a single species, Miosurnia diurna, known from a nearly complete, articulated skeleton.

[1] The Miosurnia holotype specimen, STM 20-1, was discovered in a layer of the Liushu Formation in the Linxia Basin of Gansu Province, China.

[1] In 2022, Li et al. published a paper analyzing the evolution of diurnalism in owls beginning in the late Miocene, and described Miosurnia diurna, a new genus and species of strigid.

The generic name, "Miosurnia", references the Miocene age of the holotype specimen as well as the close relation of the genus to Surnia.

[1] In their phylogenetic analyses, Li et al. (2022) recovered Miosurnia as a member of the Surniini and sister taxon to Surnia + Glaucidium.