Chirosia grossicauda is a species of fly found in Europe.

The larvae mine the lower rachis of bracken causing a swelling, known as a gall.

A white maggot mines the central vein of the pinnule (a secondary division of a frond of bracken) causing the tip to roll downwards.

[4] In Europe the fly is found from Ireland to Russia and from the Iberian Peninsula to Scandinavia.

This article related to members of the muscoid flies is a stub.