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#1 2014-08-09 15:52:53

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 944

a very dumpy Tachinid for ID, but only one photo!

I submit this with little hope of an ID. I tried to get a better shot or different angle, but it went.

It does however seem to be unusually dumpy, with broad flattened eyes as well. And there appear to be some pale hairs with the dark bristles on the thoracic dorsum. This area looks a bit odd to me, maybe not helped by the bristles not showing up very well.

I can probably only hope for a better chance another time, but I thought it worth a shot..

Nigel


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#2 2014-08-09 17:03:56

Howard Bentley
Committee
Name: Howard Bentley
Registered: 2008-07-07
Posts: 749

Re: a very dumpy Tachinid for ID, but only one photo!

Not a Tachinid, Nigel, but a Calliphorid; one of the Pollenia species - the pale crinkly hairs on the thorax are characteristic. I can't go to species, I'm afraid, from your picture.

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#3 2014-08-09 19:47:47

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 944

Re: a very dumpy Tachinid for ID, but only one photo!

Thanks Howard.
So the pale bristles were significant. It also seems odd that Calliphorid are loosely termed "bluebottles", when this doesn't look much like one! I see that the most common Pollenia is P.rudis, but mine does appear to have eyes that are less deep (apart from other things).
I am therefore hoping that it will see this species again, and get something a bit more useful.

Nigel

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#4 2014-08-09 19:59:29

Howard Bentley
Committee
Name: Howard Bentley
Registered: 2008-07-07
Posts: 749

Re: a very dumpy Tachinid for ID, but only one photo!

You really need to have most of this genus under the microscope to make reliable determinations. Note that the crinkly yellow or white hairs on the thorax often rub off on top, leaving them only at the sides, so look for them carefully. They are absolutely indicative of Pollenia.

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#5 2014-08-09 20:05:12

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 944

Re: a very dumpy Tachinid for ID, but only one photo!

Noted.
Thanks again.
Nigel

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#6 2014-08-09 21:32:13

ChrisR
Administrator
Name: Chris Raper
From: Reading, UK
Registered: 2008-03-08
Posts: 392
Website

Re: a very dumpy Tachinid for ID, but only one photo!

Bluebottle is a better description for Calliphora sp, ... I call calliphorids 'blow flies'. Pollenia are 'cluster flies' smile

There is only one species that you can determine from a photo and, as Howard said, the rest have to be examined very carefully but they are easy to ID with a specimen smile

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