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This tephritid has a bair of red bifurcating bristles on the thorax - does this enable identification to genus?

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Looks like Geomyza tripunctata (Opomyzidae):
http://www.dipter...oto_id=115

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thanks, I must have forced this one through the key somehow

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Yes, a female of Geomyza tripunctata. If I see it correctly it also has Laboulbeniales on it's thorax. Interesting. The Laboulbeniales is possible Stigmatomyces geomyzae. Walter Rossi would probably be interested in studying the Laboulbeniales.

When and where did you collect this specimen?

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Hi Jan, This specimen was collected during an entomological trip to Ashton Fields in Bristol, UK. ST 562 705 28/04/2012 whilst sweeping long grass.

There are certainly A pair of interesting structures on the thorax

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would this be a first record for Stigmatomyces geomyzae in the UK? i woud be happy to send the specimen for confirmation...

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Lovely! Can you specify the habitat a bit more? Was it in a wet environment? I would love to find some Laboulbeniales on diptera this summer!

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Dieter,

In Haelewaters et al. 2012 information on host environment (of Stigmatomyces limosinae) has been added:

"Stigmatomyces limosinae is a widely distributed species, known from Europe, but also from the USA, Jamaica, Mexico and New Zealand. In Belgium it is reported on Spelobia clunipes (Meigen) (De Kesel & Hanssens 2007), in Poland on Leptocera breviceps Stenhammar, Leptocera limosa (Fallen), Leptocera lutosa (Stenhammar) and in southern Europe on Leptocera lutosoidea (Duda) (Majewski 2008). In all cases infected hosts were collected from wet forests or exposed, eutrophized and muddy banks of ponds and rivulets." (Haelewaters D, van Wielink P, van Zuijlen JW, Verbeken A & A De Kesel, 2012. New records of Laboulbeniales (Fungi, Ascomycota) for The Netherlands. Entomologische Berichten 72 (3): 175-183.)

This kind of information is often not included in articles describing new species or new records, unfortunately enough.