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#1 2017-06-20 17:02:05

RobWolton
Committee
Name: Rob Wolton
Registered: 2009-08-13
Posts: 105

Odd spiny-tailed calypterate

The calypterate shown in this photos has me completely stumped. It is highly distinctive, with dense strong bristles at the end of the abdomen.  There are no meral bristles beneath the posterior spiracle (but there is a line of fine hairs here).  There are some fine hairs beneath the scutellum.  Anal vein does not reach wing edge.  No ventral seta on hind metatarsus. The subscutellum is not swollen. 1:2 katepisternal bristles.  Arista stongly plumose. Genitalia appear muscid.  Caught in a wet woodland in NW Wales.  I would welcome suggestions!


Uploaded Images

Last edited by RobWolton (2017-06-22 21:41:06)

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#2 2017-06-20 23:50:45

oxycera
DF Members
Name: John Coldwell
From: Barnsley
Registered: 2008-04-27
Posts: 314

Re: Odd spiny-tailed calypterate

Some kind of Muscina, perhaps?

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#3 2017-06-21 00:00:02

RobWolton
Committee
Name: Rob Wolton
Registered: 2009-08-13
Posts: 105

Re: Odd spiny-tailed calypterate

Thank you John for your suggestion, but I don't think it's a Muscina.  The discal vein does not curve up - if anything it curves downwards, the scutellum has no trace of red, and the eyes are long and densely haired. In my description I should perhaps have mentioned that the prosternum has hairs along its edges. Best wishes, Rob

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#4 2017-06-22 14:04:03

Howard Bentley
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Name: Howard Bentley
Registered: 2008-07-07
Posts: 740

Re: Odd spiny-tailed calypterate

It's still a mystery to me, Rob. I think it can only be a muscid. Have you tried running it through the genera keys in Fonseca and Gregor?

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#5 2017-06-22 14:11:44

RobWolton
Committee
Name: Rob Wolton
Registered: 2009-08-13
Posts: 105

Re: Odd spiny-tailed calypterate

Yes, I have tried running it through these genera keys but I have not succeeded in getting them to lead anywhere.

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#6 2017-06-22 15:28:36

anymarks
DF Members
Name: Neil Marks
From: Norfolk
Registered: 2009-08-07
Posts: 93

Re: Odd spiny-tailed calypterate

Thricops nigrifrons ?

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#7 2017-06-22 16:30:03

RobWolton
Committee
Name: Rob Wolton
Registered: 2009-08-13
Posts: 105

Re: Odd spiny-tailed calypterate

Thank you for this suggestion, Neil. But I don't think its a Thricops. It does not have hairs on the inner posterior margin of the hind coxae.  Also, the setae on the legs are not right for nigrifrons according to the description in Gregor.  And there's no mention of all those very conspicuous bristles on the 4th and 5th tergites.

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#8 2017-06-22 20:26:25

Stephane Lebrun
Registered user
Name: Stephane Lebrun
From: Le Havre, FRANCE
Registered: 2008-04-05
Posts: 594

Re: Odd spiny-tailed calypterate

The picture is very small and don't reveal much of the details helpful for muscidae (number of dc ? prst acr ? frons with strong proclinate or. ?, abdomen spotted ?, shape of Sc etc.), but by the appearance I would think to a male Helina, especially if you have seen small hairs under the scutellum.

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#9 2017-06-22 21:39:28

RobWolton
Committee
Name: Rob Wolton
Registered: 2009-08-13
Posts: 105

Re: Odd spiny-tailed calypterate

Thank you Stephane.  I was hoping the conspicuous strong numerous bristles on tergites 4 and 5 would be diagnostic.  I have tried running it through the Helina key but without success.  I will upload some further images.

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#10 2017-06-23 22:59:15

Stephane Lebrun
Registered user
Name: Stephane Lebrun
From: Le Havre, FRANCE
Registered: 2008-04-05
Posts: 594

Re: Odd spiny-tailed calypterate

This confirms Helina, at least.

Last edited by Stephane Lebrun (2017-06-23 22:59:49)

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#11 2017-06-25 21:13:00

conopid
DF Members
Name: Nigel Jones
From: Shrewsbury
Registered: 2008-02-27
Posts: 630
Website

Re: Odd spiny-tailed calypterate

This might be a fly to ask Adrian Pont to take a look at?


Nigel Jones
Shropshire

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#12 2017-06-25 22:07:35

Tony Irwin
DF Members
Name: Tony Irwin
From: Norwich
Registered: 2008-03-01
Posts: 643

Re: Odd spiny-tailed calypterate

May be worth posting on Diptera.info as well - Nikita Vikhrev might recognise it.

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#13 2017-06-26 00:47:24

Stephane Lebrun
Registered user
Name: Stephane Lebrun
From: Le Havre, FRANCE
Registered: 2008-04-05
Posts: 594

Re: Odd spiny-tailed calypterate

The only I would see if meron has small hairs as the underneath of scutellum would be Helina evecta/annosa. You can ask for Nikita for many other genera (Hydrotaea, Thricops, Lispe, Limnophora, Coenosia), but I'm afraid Helina is not is favourite genus wink

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#14 2017-06-27 22:30:14

RobWolton
Committee
Name: Rob Wolton
Registered: 2009-08-13
Posts: 105

Re: Odd spiny-tailed calypterate

I'm most grateful to Adrian Pont who has solved the mystery.  It is an aberrant Helina evecta (as you suspected Stephane).  Adrian tells me that the presence of erect stout spinose setae on the abdomen is something that occurs occasionally in Helina and that he has seen several Helina reversio with such hedgehog setae.  Thanks to all of you have commented and put forward ideas.  It is a relief to know what it is!

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#15 2017-06-28 13:19:48

oceanlis2000
Registered user
Name: Array Array
Registered: 2010-07-12
Posts: 900

Re: Odd spiny-tailed calypterate

Rob this would be interesting to write up in Dipterists Digest, it certainly should be documented in print!

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#16 2017-06-29 15:17:58

oceanlis2000
Registered user
Name: Array Array
Registered: 2010-07-12
Posts: 900

Re: Odd spiny-tailed calypterate

Hello Rob, are you sure that there are 1:2 stpl, I can only find 2:2 for evecta in Hennig 1964, of course this may be the case on an aberrant fly so would be interesting to know

Last edited by oceanlis2000 (2017-06-29 15:18:21)

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#17 2017-07-14 14:40:54

RobWolton
Committee
Name: Rob Wolton
Registered: 2009-08-13
Posts: 105

Re: Odd spiny-tailed calypterate

Sorry about delay in reply - have been away.  The specimen does have a weak second anterior sternopleural on one side, but not on the other.

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#18 2017-07-14 15:42:39

oceanlis2000
Registered user
Name: Array Array
Registered: 2010-07-12
Posts: 900

Re: Odd spiny-tailed calypterate

Hi Rob

Thanks for the reply

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