Larvae feed on bracken and water fern.
Large ferns e.g. water fern.
A pair of specialised setae on the abdomen triggers a defensive response when touched (drops from the host vigorously twisting to hide in leaf litter).
Pupates in silk cocoon among host fronds or in detritus.
Males have simple antennae. September to April. Flies at night, visiting flowers, attracted to light. Drops to ground to feign death when disturbed.
15 - 17mm