Geomyza tripunctata

Quite a distinctive fly apparently, and evidently very common. Geomyza majuscula has a fairly similar wing pattern (but lacking the clouding at the base). The key also draws attention to differences in the setae on the anepimeron and the shape of sternite 8 on the female terminalia. The smaller setae were hard to see but both flies showed one strong seta on the anepimeron which should be lacking on majuscula. Sternite 8 seemed to be slightly notched on both which is not quite as described and illustrated in the key (entire in tripunctata) but even more unlike that described and illustrated for majuscula (it more closely resembles the illustration for venusta but the wing pattern rules that out).

female Geomyza tripunctata showing anepimeron and sternite 8, Wendling Beck Environment Project (Norfolk, UK), 18th November 2022

second female Geomyza tripunctata showing anepimeron, Wendling Beck Environment Project (Norfolk, UK), 18th November 2022

female Geomyza tripunctata showing anepimeron, base of wing and ovipositor, Wendling Beck Environment Project (Norfolk, UK), 3rd August 2023