BL approx 2-3mm. Slowly & determinedly appeared to be drilling into this gall. On leaves of coppiced Eucalyptus grandis?Abundant growth to about 5m above ground. We leave tree/s in place & coppice every year to reduce fire risk. Cuttings are chipped to mulch. These pics are of what was present on pre- mulch pile. I photo what I can find & shake them before mulching .
Photographic notes - Three shot focus stack.