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Hi Sarah,

Before long you will be the expert giving advice to others. You seem to be learning quickly in a wide range of families. I have to admit that my knowledge is limited to a small number of families.
In this case you are indeed dealing with a member of the genus Geomyza. It is a nice picture of the female of Geomyza tripunctata. In southern Europe Geomyza tripunctata often has a rather reddish thorax, but this specimen looks more like the ones we find in The Netherlands.

Jan Willem