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Note ending of "family group" names.

Cecidomyiidae (family) is divided into 3 or 5 subfamilies.

Cecidomyiinae (subfamily) is conventionally divided into supertribes. This is the only group of Diptera where supertribes are in common use. There are two supertribes in Europe.

Cecidomyiidi (supertribe) males generally have very long antennae with 24 apparent segments separated by narrow stems. Females have 12 segments with short stems. The antennae are longer than your fly's.

Lasiopteridi have a variable number of flagellomeres. In Lasioptera the antennae are very short.