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#1 2017-12-18 17:48:48

DavidG
Registered user
Name: David Gould
From: Leicestershire
Registered: 2011-09-18
Posts: 4

Tephritis divisa/separata?

Hi,

The attached images were submitted to NatureSpot as possible T. bardanae. This didn't look right to me however and after some digging around I think it may be T. divisa or T. separata.

Does this look right to people? Can they be separated from the images supplied?

Taken in Leicestershire (VC55), 27.x.2017.

Thanks,
David


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Last edited by DavidG (2017-12-18 17:49:27)

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#2 2017-12-19 00:56:19

conopid
DF Members
Name: Nigel Jones
From: Shrewsbury
Registered: 2008-02-27
Posts: 647
Website

Re: Tephritis divisa/separata?

Looks a lot like T. divisa


Nigel Jones
Shropshire

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#3 2017-12-19 16:55:03

DavidG
Registered user
Name: David Gould
From: Leicestershire
Registered: 2011-09-18
Posts: 4

Re: Tephritis divisa/separata?

Thanks Nigel,

Am I right in reading your answer as probably T. divisa, but not enough to be certain? NatureSpot images are verified under the iRecord system so I'm thinking that a redetermination of T. divisa and a status of 'plausible' would be most appropriate.

Thanks,
David

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#4 2017-12-19 21:00:41

Tony Irwin
DF Members
Name: Tony Irwin
From: Norwich
Registered: 2008-03-01
Posts: 687

Re: Tephritis divisa/separata?

I'd be interested to know if divisa can be separated easily from separata.

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#5 2017-12-20 22:42:58

conopid
DF Members
Name: Nigel Jones
From: Shrewsbury
Registered: 2008-02-27
Posts: 647
Website

Re: Tephritis divisa/separata?

Hi David and Tony,
Yes, I am saying PROBABLY (or even possibly), but only based on comparing the wing images in Smit's Dutch Tephritid book. To be certain a specimen would be required and even then I don't know what the indicative features would be?

Smit shows slightly more extensive shading across the area of the wing around A1 and A2 veins, but this would not be a brilliant feature for a firm determination, as it may well vary across the two species.


Nigel Jones
Shropshire

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#6 2017-12-23 14:25:11

Laurence Clemons
DF Members
Name: Laurence Clemons
Registered: 2008-04-02
Posts: 360

Re: Tephritis divisa/separata?

The type descriptions of Tephritis divisa and T. separata by Camillo Rondani in 1871 were based on the number and alignment of hyaline spots in the wings and all subsequent key works ascertained also refer to these. I have reared Tephritis divisa from Helminthotheca echiodes and there is so much variation in the wing pattern as to make it an unreliable diagnostic character. It may be that the only way to distinguish between the two species is from early stages in the host plant - Tephritis separata allegedly develops in the capitula of Picris hieracioides.

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#7 2017-12-26 00:09:19

DavidG
Registered user
Name: David Gould
From: Leicestershire
Registered: 2011-09-18
Posts: 4

Re: Tephritis divisa/separata?

Many thanks for the explanations Nigel and Laurence, very interesting. And something to feed back to the recorder too.

David

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