See text The Mylagaulidae or mylagaulids are an extinct clade of sciuromorph rodents nested within the family Aplodontiidae.

[1][2] They are known from the Neogene of North America and China.

[3][4] The oldest member is the Late Oligocene Trilaccogaulus montanensis that lived some 29 million years ago (Mya), and the youngest was Ceratogaulus hatcheri—formerly in the invalid genus "Epigaulus" [2][5]—which was found barely into the Pliocene, some 5 Mya.

The taxonomy of Galbreathia is not resolved; it might belong in Mylagaulinae, but lacks the characteristic apomorphies.

[6] Promylagaulinae Mesogaulinae Mylagaulinae incertae sedis