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#1 2014-12-19 18:15:26

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 932

black & grey Tachinid (?) with orange scutellum

Using the Stuart Ball key to families, it is difficult without a specimen to hand, to check if the sub-scutellum is swollen. Even an image from the side is unlikely to help. Is there another feature that's useful, apart from the jizz, of a squat, bristly fly, etc? (this is an area I am having repeated difficulty with).

This one has the right sort of venation for a Sarcophagidae, and the appearance of a somewhat striped thorax, and a somewhat chequered abdomen. Though it doesn't convince me enough.

Given no further clues, I am thinking this is therefore a Tachinid.

Unfortunately I don't have any side views, and the view from the front (last image) is a bit blurred.

Please advise!

Nigel


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#2 2014-12-19 19:15:00

oxycera
DF Members
Name: John Coldwell
From: Barnsley
Registered: 2008-04-27
Posts: 317

Re: black & grey Tachinid (?) with orange scutellum

It looks like a tachinid and Phryxe sp. comes to mind, but I would wait for a specialist, these things can be really tricky from photographs.

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#3 2014-12-19 21:36:05

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 932

Re: black & grey Tachinid (?) with orange scutellum

So I might be on the right lines this time!  Thanks John.
It does appear that Tachinids are best not done by images - I have quite a low success rate in getting to a species. But something quite distinctive makes a difference, and I suspect this one (with a scutellum coloured a bit like some Phaonia sp) might make all the difference.

Maybe Chris will spot this one.

Nigel

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#4 2014-12-20 17:24:10

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

Re: black & grey Tachinid (?) with orange scutellum

Certainly a tachinid (that's the easy bit!) ... and I can see why John suggested a Phryxe (it's a fair bet with an average-looking tachinid with an orange-scutellum) but with that shape of head and the really bright orange scutellum (not just orange-tipped) with a distinct lack of median discal bristles and a slightly pale tibia then it should be a Carcelia smile  If you had a side view we would have seen that the eye is really huge. It's more difficult to say which Carcelia though, from a photo, so at this point I usually ask to see a specimen wink

Last edited by ChrisR (2014-12-20 17:26:31)

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#5 2014-12-21 01:29:00

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 932

Re: black & grey Tachinid (?) with orange scutellum

So once again I should have had a side view (not that I didn't try), or the fly itself.
Never mind.

Thanks Chris.

Regards
Nigel

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#6 2014-12-22 12:58:07

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

Re: black & grey Tachinid (?) with orange scutellum

Yeah, the problem with tachinids is that they're seldom a "single Shot" identification. Of course there are distinctive species and an expert can sometimes see enough from one photo (it's definitely a Carcelia but a side view would have made it easier) but the species identifications often depend on frons/eye-width ratio measurements which can be quite tricky to get right even with a specimen. I always refer to genitalia if I am given a male because this is very distinctive smile

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