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#1 2015-03-05 19:11:10

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 1019

Can this be anything other than a Calliphoridae?

I am really puzzled by this one, seen 4th March, on a dark wall.  Size c 7-8 mm. I had to use flash, or I would not have got any decent images.

I have eliminated Muscidae because cell r4+5 is closed. It doesn't look as if it has a vein petiole, but it meets right on the wing margin.
The wing veins are strangely indistinct (I don't think it's the flash causing that), and the wings themselves are somewhat opaque. Some veins look more like folds.
The vein Sc does curve distinctly towards its apex, and the anal veins (from what I can make out) don't look as though they are converging much at all. M1 strongly curved towards R4+5.
Thorax has a lustrous sheen.
It seems to fit Calliphoridae more than anything else, and cell r4+5 can be closed and doesn't break the rules, though it is rare.
If it is a Calliphoridae, then it is a strange colour on the thorax anyway - it reminds me of translucent silicone mastic, with that sort of lustre! The abdomen has a hint of pale yellow in the grey.

I am also puzzled by the head shape, with eyes moved sideways (which reminds me, unhelpfully, of Gonia picea!), and a bulging  face. I can see what look like yellow palps under the head.
Yet another strange feature is the black shape just behind what I assume are the ocelli (several black dots). It looks to be right on the vertex, and actually looks from the top like a minute black mite with black legs. I estimate it to be about 0.25 mm diameter.
I have looked at other possibilities, but can't see it as being anything other than a Calliphoridae. But then I can't see any blowflies that look like this either.

Nigel G.


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#2 2015-03-05 23:07:19

ChrisR
Administrator
Name: Chris Raper
From: Reading, UK
Registered: 2008-03-08
Posts: 394
Website

Re: Can this be anything other than a Calliphoridae?

Hi Nigel

I would say that it's a teneral (freshly emerged) calliphorid. It could still be a muscid (the median vein can bend with some genera) but the overall shape looks like a Calliphora or something like that smile

Best wishes,
Chris R.

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#3 2015-03-06 00:15:03

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 1019

Re: Can this be anything other than a Calliphoridae?

Hi Chris

I assume from what you say that its appearance could be misleading if it's a teneral, so maybe further deductions are not possible. Though I would (guessing a bit) expect that the projecting face would remain a feature even when it's assumed a complete adult form, but it will only be the placement and hues of the colours that will alter.

I still think it looks quite interesting!

best wishes
Nigel G.

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#4 2015-03-06 19:34:53

ChrisR
Administrator
Name: Chris Raper
From: Reading, UK
Registered: 2008-03-08
Posts: 394
Website

Re: Can this be anything other than a Calliphoridae?

The head swells up on most flies to break the puparium and allow them to get out, so it is a transient feature. The colours will also darken in the wing and body wink

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