Aceria mackiei, previously Eriophyes mackiei, the live oak erineum mite, is an abundant eriophyoid mite that produces leaf-blister galls on coast live oak, interior live oak, huckleberry oak, and canyon live oak.[1] This mite's ability to induce galls in oaks of both the black oak group and the intermediate oak group is unique. The distribution of this arthropod is western North America.[2]