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Most users ever online was 248 on Wed Dec 12, 2007 11:53 pm


Unknown hoverfly - help please.

 
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yorkie in fod



Joined: 02 Sep 2009
Posts: 208

PostPosted: Mon May 09, 2011 3:45 pm    Post subject: Unknown hoverfly - help please. Reply with quote

I saw this hoverfly on 8th May on a Euphorbia plant beside a footpath in the Forest of Dean. It was very small and compact, and I'm fairly sure I haven't seen this species previously.

http://i635.photobucket.com/albums/uu80/maris-uk/unk15hoverIMG_7858.jpg

http://i635.photobucket.com/albums/uu80/maris-uk/unk15hoverIMG_7855.jpg

http://i635.photobucket.com/albums/uu80/maris-uk/unk15hoverIMG_7853.jpg

Any thoughts on a possible id would be most welcome.

Thanks

Yorkie
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Geoff F



Joined: 10 May 2010
Posts: 155

PostPosted: Mon May 09, 2011 6:53 pm    Post subject: Reply with quote

Pure guess, Yorkie.

It rather reminds me of a hairy Cheilosia variabilis which makes me wonder about Cheilosia vulpina.

But I don't have any personal experience with this species. Mostly a southern species but it can be found as far as N. Yorkshire.

However, even if Cheliosia is correct, they are a complicated family. So this is just a starting guess not a positive ID.
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Geoff F



Joined: 10 May 2010
Posts: 155

PostPosted: Tue May 10, 2011 7:55 pm    Post subject: Reply with quote

Those long third antennae segments have been bothering me, Yorkie, and as an alternative I wonder about one of the Pipizella species.

But this is also a family about which I know very little and I'm still not sure about that pale face.

And after reading a bit more I think that Heringia possibly H. senilis might be worth a look.

But they are all new species to me so I think a real expert is required.
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yorkie in fod



Joined: 02 Sep 2009
Posts: 208

PostPosted: Wed May 11, 2011 10:40 am    Post subject: Reply with quote

Geoff

Thanks for your comments. I didn't know where to start with this species, so I'll follow your ideas and do some further reading. I've included another photo below which has a better view of the wing venation.

http://i635.photobucket.com/albums/uu80/maris-uk/unk15hoverIMG_7851.jpg

Regards

Yorkie
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Geoff F



Joined: 10 May 2010
Posts: 155

PostPosted: Fri May 13, 2011 6:23 pm    Post subject: Reply with quote

Going by the angle of the outer cross veins with a bend approx half way along would tend to take me back to Pipizella.

Bright black with a slight bronze tint and long hairs on the hind tibia would also make me consider P. virens as the most likely; providing that Pipizella is correct.

Would wing length about 6 mm fit?

But in all honesty, this is just very rough guesswork so a real expert is required. Even then, I expect that they would be reluctant to give a definite answer without seeing an actual specimen.
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conopid



Joined: 03 Sep 2005
Posts: 342
Location: Shrewsbury, Shropshire

PostPosted: Fri May 13, 2011 8:31 pm    Post subject: Reply with quote

I think Geoff is right - Pipizella species.
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Nigel Jones
Shrewsbury
Shropshire
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Tony White



Joined: 12 Mar 2006
Posts: 61
Location: Byfield, Northants

PostPosted: Tue May 24, 2011 7:19 am    Post subject: Reply with quote

Certainly Pipizella virens is on the wing at the moment. I took a specimen in south-west Northants on the 23rd May and although yours is rather early it is perfectly feasible given the very warm spring we've had.
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Roger K.A. Morris



Joined: 06 Nov 2005
Posts: 1652

PostPosted: Wed Jun 08, 2011 8:33 am    Post subject: Reply with quote

This is P. viduata - the antennae are wrong for P. virens.

Regards

Roger
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