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The Society for the study of flies (Diptera)

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#1 2017-12-05 19:36:11

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 912

A Muscidae with bright red eyes, on dung.

Based on venation and other features with similarities, this is very like flies in the Hydrotaea genus.
On Dipterists Info, it has an excellent likeness (apart from being a female) to an image of Hydrotaea penicillata. But that doesn't appear to be a UK species. So I am still just hoping these various views might be sufficient for an ID (but unfortunately  no clear view of the top of the abdomen).

Seen early October, on a pile of cattle dung.

Nigel G.


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Last edited by Gateside (2017-12-05 19:36:51)

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#2 2017-12-05 22:30:18

Stephane Lebrun
Registered user
Name: Stephane Lebrun
From: Le Havre, FRANCE
Registered: 2008-04-05
Posts: 597

Re: A Muscidae with bright red eyes, on dung.

I'm pretty sure it is one of the females Mydaea with dilated palpi, like Mydaea anicula (I can't see whether the arista is pubescent only).

Stephane.

Last edited by Stephane Lebrun (2017-12-05 22:32:10)

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#3 2017-12-06 00:09:57

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 912

Re: A Muscidae with bright red eyes, on dung.

Thanks for your helpful comments, Stephane. ( thought it likely I wasn't going to be right with the ID).

If you look at the third image with a magnifying glass, hopefully you can see quite long fine hairs radiating forwards from the arista. I can see them quite clearly. They are too perfectly aligned with what one would expect to be a coincidence. So it looks like it has fine long hairs, not short ones.

Any use?

Nigel G.

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#4 2017-12-06 23:34:22

Stephane Lebrun
Registered user
Name: Stephane Lebrun
From: Le Havre, FRANCE
Registered: 2008-04-05
Posts: 597

Re: A Muscidae with bright red eyes, on dung.

So it has to be another species. My feeling is that if the arista where plumose, I should be able to see it on the last picture (on black background and rather focused). But we'll never now...

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#5 2017-12-06 23:59:23

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 912

Re: A Muscidae with bright red eyes, on dung.

Thank you for your efforts, Stephane.

This muscid does have a plumose arista. But I can't see any of the arista hairs when I display the images DIRECTLY on my computer screen, no matter how much I try to manipulate them. There must be something in the Dipterists Forum software that displays images in a more intelligent way, so that very fine features are sometimes visible. I have noticed this before - that some small feature is only visible when shown here, and not otherwise. It's weird! Perhaps somebody can explain it to me. It would useful to have than ability when looking at images BEFORE one uploads them into a post like this.

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