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This fly raised from a larva found in a Mycena (Bonnet) mushroom in a park in Suffolk, UK.
Three maggots were found on 26 Nov 2014.
They pupated around 17 Dec 2014.
This fly emerged on 11 Jan 2015 and it was killed on 13 Jan.
I'll share photos of the fly, pupae, maggot and the mushroom.
Please help me identify this specimen.
The wing length is about 5mm.
If some features are not visible in the photos, please let me know and I will try to capture them.

Best wishes,
Martin

First, a dorsal view

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lateral

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pupae

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larva

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and last but not least, the mushroom where I found it

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The fly and puparia are Suillia (not sure which species - being female and slightly teneral makes it difficult). The larva is that of a mycetophilid (note the well-developed head capsule).

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I think Sulia nigricornis is the only species with that dark antenna

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Tony, Does that mean the larva isn't the one that turned into this fly. I did find a rather squashed specimen of a different species in the container with the fungus. Maybe that was the Mycetophilid adult?
mossnisse, I can't find a S nigricornis, but there is a S atricornis in the UK list. But that species has humeral seta according to Phil Withers key to British Suillia...

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The larva you photographed is Mycetophilidae. Heleomyzidae larvae are more like a typical maggot, with a pointy head end, blunt "tail" and no well-developed head capsule. Do send me a photo (or specimen) of the squashed thing - if it's a male, we should be able to get a species name on it.

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female of Suillia sp. Helomyza nigricornis is a synonym of Tephrochlamys rufiventris. Andrzej

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Thanks Tony. I'll post a couple of photos of the (remains of) the Mycetophilid adult as a new topic,
Thanks Andrew, I've sent you a pm.

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Another fly emerged from the remains of the mushroom. I found it on 19 Jan and provided it with diluted honey as previously suggested. Here are photos of the adult taken through the glass of the jar.

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I think this second adult is male. Is that right?

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I killed the fly on 21 Jan. here are some photos of the pinned specimen.

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face and front legs

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underside and legs

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Unfortunately I was on away for a week and so couldn't take any more photos until 28 Jan, by which the fly was rather dried up... especially the femora that seem to have collapsed in on themselves.
Here is the only shot I took.
When I tried to reposition the fly to do detailed photos from a different angle part of the thorax broke away and the fly was dangling loosely from the pin.
I've tried gluing on more firmly but have not tried any more photos.
Please help me identify the species of this Suillia sp.
If I need to prepare photos of the genitalia, please advise on the best method.
Best wishes,
Martin

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female: Suillia sp. "A"; male: Suillia sp. "B". Next time more about the species names ... ;) Andrzej.

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The male specimen (Suillia "B") belongs to Suillia bicolor. Palpus is yellowish. The female (Suillia "A") is another species not yet recognized.
The female terminalia have to be macerated ...