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The Society for the study of flies (Diptera)

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#1 2018-08-09 09:29:53

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 973

A rather smart fly - Loxocera aristata?

I see there are not many Loxocera posts on the forum, and some of them (abortive!) are mine anyway.

Using the Diopsoidea key by Darwyn Sumner, I think this Loxocera aristata, or is it just wishful thinking?

The area below the antennae is black, except for the "postgenal stripe", and other features seem to be okay.
There is no image of this species in the key, though the other species have one. I have noticed a lack of images elsewhere - e.g. Dipterists Info site. So I am not able to compare my example.

Is this ID good?

Thanks
Nigel.


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#2 2018-08-09 11:37:45

andrewsi25
DF Members
Name: Ian Andrews
From: Pocklington, East Yorkshire
Registered: 2008-07-11
Posts: 253

Re: A rather smart fly - Loxocera aristata?

The face looks yellow to me, though admittedly rather dark. I suspect this is Imantimyia (was Loxocera) albiseta.

Hopefully, Darwyn will comment...

Ian

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#3 2018-08-09 12:17:32

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 973

Re: A rather smart fly - Loxocera aristata?

Thanks Ian.

It would be nice if it were possible to pin it down, as it were.

Nigel

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#4 2018-08-09 12:53:23

Tony Irwin
DF Members
Name: Tony Irwin
From: Norwich
Registered: 2008-03-01
Posts: 731

Re: A rather smart fly - Loxocera aristata?

Nice photos, Nigel, but I can't get a clear idea of the length of the aristal hairs - you don't have the specimen by any chance?

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#5 2018-08-09 15:43:54

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 973

Re: A rather smart fly - Loxocera aristata?

Thanks Tony.

No, I didn't collect it, but I am tempted to have a look for it (though very unlikely it's around now)

However I've had a play with a couple of photos where the hairs on the arista can be just about made out. They seem to be about the width of the arista in the middle, a bit less elsewhere. Here is the best one, much magnified.


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#6 2018-08-09 17:26:46

Tony Irwin
DF Members
Name: Tony Irwin
From: Norwich
Registered: 2008-03-01
Posts: 731

Re: A rather smart fly - Loxocera aristata?

Thanks, Nigel. I think those hairs relatively short, which would suggest aristata - the hairs on albiseta are longer - but it's still marginal, I'd say. One of the problems is that I see so few, it's difficult to assess the range of variation.

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#7 2018-08-09 18:07:52

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 973

Re: A rather smart fly - Loxocera aristata?

Oh dear, I've failed again with this group, though I have no familiarity with them anyway. They seem hard to ID.

I am assuming that the key I mentioned above doesn't resolve it in this case (for instance the gena are neither yellow nor black, but a bit of both).

I shall try to remember to catch one next time.

Nigel

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