Micropterix trifasciella is a species of moth belonging to the family Micropterigidae and was described by John Heath in 1965.

[1] It is recorded in the French and Italian Alps, and is known to inhabit herbaceous plants at an elevation range of 1,400–1,900 metres (4,600–6,200 ft).

Male Micropterix trifasciella have a wingspan of 3.4–4.7 millimetres (0.13–0.19 in), while females have a wingspan of 4.2–4.8 millimetres (0.17–0.19 in).

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