Elachista triatomea is a moth of the family Elachistidae found in Europe.
The wingspan is 8–. Head white.
Adults are on wing from June to July.[1]
The larvae mine the blades of various grasses of Festuca species, including sheep's fescue (Festuca ovina), red fescue (Festuca rubra) and fine-leaf sheep fescue (Festuca tenuifolia).
It is found in Ireland, Great Britain, Fennoscandia, Denmark, Germany, Austria, the Czech Republic, Hungary and Romania.[2]